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SECTION 7A

HEATING AND VENTILATION SYSTEM

Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.

DESCRIPTION AND OPERATION

HEATING AND VENTILATION SYSTEM

The base heater system is designed to provide heating, ventilation, windshield defrosting, side wind defogging and rear seat area.
The heater and fan assembly blower regulates the airflow from the air inlet for further processing and distribution.
The heater core transfers the heat from the engine coolant to the inlet air.
The temperature door regulates the amount of the air that passes through the heater core. The temperature door also controls the temperature of the air by controlling mix of heated air with the ambient air.
The mode door regulates the flow and distribution of the processed air to the heater ducts and to the defroster ducts.
The console mounted heating and ventilation control panel contains three rotary control knobs, and two push control knobs, which operate as follows:

Rotary Temperature Control Knob

Rotary Blower Control Knob

Rotary Mode Control Knob

Intake Air Control Knob

Rear Windshield Defogger Push Knob

Heater Core

The heater core heats the air before enters the vehicle. Engine coolant is circulated through the core to heat the outside air passing over the fins of the core. The core is functional at all times and may be used to temper conditioned air in the A/C mode as well as in the heat or the vent mode.

COMPONENT LOCATOR

AIRFLOW THROUGH VENTS WITH REAR HEATING DUCT


UAA7A200
Display graphicTranslations of text in graphics


  1. Side Ventilation Duct
  2. Front Window Defroster Duct
  3. Front Air Distribution Duct
  4. Junction Block
  5. Rear Heater Duct Connector
  6. Rear Heater Duct
  7. Rear Heater Duct Extention

DIAGNOSTIC INFORMATION AND PROCEDURES

HEATER SYSTEM

INSUFFICIENT HEATING OR DEFROSTING

Caution : The cooling system is pressurized when hot. Injury can result from removing the coolant reservoir cap before the engine is sufficiently cool.

Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
  1. Check the coolant level.
  2. Check the serpentine accessory drive belt for tension or damage.
  3. Check the coolant hoses for leaks or kinks.
  4. Check the coolant reservoir cap. Refer to Section 1D, Engine Cooling.
  5. Repair or replace any defected parts as needed.
Is the repair complete?
-
System OK
Go to Step 3
3
  1. Set the A/C switch OFF on the vehicles equipped with air conditioning.
  2. Set the temperature control knob to full hot.
  3. Set the blower motor switch on 4.
  4. Turn the ignition ON.
  5. Check for the airflow from the vent outlet.
Is there a heavy airflow from the vent outlet?
-
Go to Step 4
Go to Step 18
4
Check for change in the airflow at various blower speeds.
Does the blower speed increase as the switch is turned from 1 to 4?
-
Go to Step 5
5
  1. With the engine sufficiently cool, remove the coolant reservoir cap.
  2. Set the blower motor switch on 4.
  3. Set the temperature control knob to full hot.
  4. Start the engine and idle the engine.
  5. Watch for the flow of the coolant.
Is the coolant flow visible?
-
Go to Step 9
Go to Step 6
6
Check the thermostat. Refer to Section 1D, Engine Cooling.
Does the thermostat installed and seated properly?
-
Go to Step 7
Go to Step 8
7
Replace the thermostat. Refer to Section 1D, Engine Cooling.
Is the repair complete?
-
System OK
-
8
Reinstall the thermostat.
Is the repair complete?
-
System OK
-
9
  1. Install the coolant reservoir cap.
  2. With the ignition ON, allow the engine to warm up for about 20 minutes. Drive the vehicle at 48 km/h (30 mph).
  3. Use a thermometer to measure the ambient air temperature and the discharge air temperature at the heater outlet.
Does the heater output meet the minimum value given?
Go to Step 10
Go to Step 11
10
  1. Check the vehicle for cold air leaks at the following locations:
    • Dash.
    • Heater cases.
    • Vents.
  2. Check under the seat for obstructions.
  3. Repair any leaks or obstructions.
Are the repairs complete?
-
System OK
-
11
  1. Turn the ignition OFF.
  2. Turn the temperature control knob to full cold, then rapidly to full hot.
  3. Listen for a second of the end of travel range of the control knob
Does the door slam?
-
Go to Step 13
Go to Step 12
12
  1. Check the following aspects of the temperature door:
    • Travel
    • Cables
    • Linkage
  2. Verify the accuracy of the temperature controls at full hot.
  3. Verify the accuracy of the temperature controls at full cold.
Is the repair complete?
-
System OK
-
13
  1. Set the temperature door to full hot.
  2. Start the vehicle
  3. Check the temperature of the heater inlet hose and the heater outlet hose by feel. The air temperature around the hoses should be at least 29°C (84°F).
Is the heater inlet hose hot and heater outlet hose warm?
-
Go to Step 19
Go to Step 14
14
Inspect heater hoses for proper installation.
Are heater hoses reversed?
-
Go to Step 15
Go to Step 16
15
Reinstall the heater hoses properly.
Is the repair complete?
-
System OK
Go to Step 17
16
  1. Back flushes the heater core.
  2. Drain the cooling system.
  3. Replace the coolant.
  4. Warm the engine to an average operating temperature.
  5. Feel the heater inlet hose and outlet hose.
Are the heater inlet hose hot and the heater outlet hose warm?
-
System OK
Go to Step 17
17
Replace heater core.
Is the repair complete?
-
System OK
-
18
Recheck the system using the "Control setting/Correct Results" tests. Refer to "Improper air Delivery or No Mode Shift" in this section.
Is the repair complete?
-
System OK
Go to Step 19
19
Check for airflow from the defroster or the vent outlets.
Is there high airflow form the defroster or vent outlets?
-
Go to Step 20
Go to Step 21
20
Check the heater door at the floor and the vent door to get proper airflow, verify proper operation, and repair as required.
Is the repair complete?
-
System OK
-
21
Push the defroster knob.
Is the defroster airflow OK?
-
Go to Step 22
Go to Step 23
22
  1. Remove the heater outlet and check for obstructions.
  2. Remove any obstructions in the heater outlet.
Is the repair complete?
-
System OK
-
23
Check for obstructions in the system at blower inlet and the air filter, if the vehicle equipped with one.
Are there any obstructions?
-
Go to Step 24
Go to Step 25
24
Remove the obstructions in the system at the blower inlet or replace a clogged filter.
Are the repairs complete?
-
System OK
-
25
  1. Set the blower on 4.
  2. Slide the temperature control knob from full hot to full cold.
  3. Listen for an airflow change.
Does the airflow change?
-
Go to Step 26
Go to Step 27
26
  1. Check the following aspects of the temperature door:
    • Travel.
    • Cable.
    • Linkage.
    • Control
  2. Verify the accuracy of the temperature controls at full hot.
  3. Verify the accuracy of the temperature controls at full cold.
Is the repair complete?
-
Go to Step 1
-
27
  1. Check the system for any obstruction between the blower and the system outlets.
  2. Remove any obstructions.
Is the repair complete?
-
Go to Step 1
-

BLOWER ELECTRICAL

Refer to "Non A/C Diagrams" for electrical schematic Diagram of the circuits described in this procedure.
Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
Does the blower run at any speed?
-
Go to Step 12
Go to Step 3
3
  1. Disconnect the power connector from the blower motor under the dashboard on the passenger side of the vehicle.
  2. Turn the ignition ON.
  3. Turn the blower ON.
  4. Test the voltage on the connector. The terminal connected to the DK BLU/WHT wire is positive and the terminal connected to the BLK wire is negative.
Is the voltage within the specified range?
11-14 V
Go to Step 4
Go to Step 5
4
Replace the blower motor.
Is the repair complete?
-
System OK
-
5
Check fuse F18 in the I/P fuse block.
Is the fuse blown?
-
Go to Step 6
Go to Step 7
6
  1. Turn the ignition ON.
  2. Use a short detector to locate the following possible short:
    • From the fuse F18 to terminal B3 of blower speed switch.
    • From the blower speed switch to blower resister block.
    • From the blower resister block to blower motor.
    • From the blower switch to blower high relay.
  3. Repair any short.
  4. Replace any blown fuse.
Is the repair complete?
-
System OK
-
7
  1. Turn the ignition OFF.
  2. Measure the resistance between following terminal 1 of blower motor and body.
Does the resistance within specified value?
≈ 0 Ω
Go to Step 9
Go to Step 8
8
Repair the open circuit.
Is the repair complete?
-
System OK
-
9
Measure the resistance between terminal 3 of blower resister and terminal 2 of blower motor.
Is the resistance within specified value?
≈ 0 Ω
Go to Step 11
Go to Step 10
10
Repair the open circuit.
Is the repair complete?
-
System OK
-
11
  1. Using ohmmeter, check continuity between terminal B3 of blower speed switch and following terminals.
    • At blower switch position 1, terminal 1 of blower resister
    • At blower switch position 2, terminal 2 of blower resister
    • At blower switch position 3, terminal 4 of blower resister
    • At blower switch position 4, terminal 86 of the blower relay.
  2. Repair or replace open circuit, blower switch, or blower resister.
Is the repair complete?
-
System OK
-
12
Does the blower run except blower switch position 4?
-
Go to Step 13
Go to Step 14
13
  1. Using ohmmeter, check continuity between terminal B3 of blower speed switch and following terminals.
    • At blower switch position 1, terminal 1 of blower resister
    • At blower switch position 2, terminal 2 of blower resister
    • At blower switch position 3, terminal 4 of blower resister
  2. Repair or replace open circuit, blower switch, or blower resister.
Is the repair complete?
-
System OK
-
14
Check fuse EF4 in the engine fuse block.
Is the fuse blown?
-
Go to Step 15
Go to Step 16
15
  1. Turn the ignition ON.
  2. Use a short detector to locate the following possible short:
    • From the fuse EF4 to terminal 87 of blower relay.
    • From the terminal 30 of blower relay to terminal 2 of blower motor.
  3. Repair any short.
  4. Replace any blown fuse.
Is the repair complete?
-
System OK
-
16
Using ohmmeter, measure the resistance between following terminals:
  • Terminal A5 of blower switch and terminal 86 of blower relay.
  • Terminal 30 of blower relay and terminal 2 of blower motor.
  • Terminal 85 of blower relay to ground G102.
Is the measurement within the specified value?
≈ 0 Ω
Go to Step 18
Go to Step 17
17
Repair open circuit.
Is the repair complete?
-
System OK
-
18
Replace the blower relay.
Is the repair complete?
-
System OK
-

IMPROPER AIR DELIVERY OR NO MODE SHIFT

This procedure provides a test of all functions of the heater/defroster unit.
  1. Warm up the vehicle.
  2. Keep the engine running.
  3. Perform the tests outlined in the table below and look for the results indicated.
CONTROL SETTINGS
CORRECT RESULTS
MODE KNOB
TEMP. CONTROL
BLOWER MOTOR SWITCH
BLOWER SPEED
POWER VENT OUTLET
FLOOR OUTLET
DEFROST OUTLET
SIDE WINDOW OUTLET
Vent
Cold
Off
Off
No Airflow
No Airflow
No Airflow
No Airflow
Vent
Cold
4
High
Ambient Airflow
No Airflow
No Airflow
No Airflow
Floor
Cold to Hot
4
High
No Airflow
Cold to Hot Airflow
No Airflow
No Airflow
Defroster
Cold to Hot
4
High
No Airflow
No Airflow
Cold to Hot Airflow
Minimum Cold to Hot Airflow
If any of these settings does not procedure the correct results, perform the following diagnostic procedure. Refer to "Non A/C Diagrams" for electrical schematic Diagram of the circuits described in this procedure.

Improper Air Delivery or No Mode Shift

Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
Examine the affected door in the unit for proper cable attachment.
  • Check the actuator connection to the door.
  • Check that the cable hose is properly connected.
Is the cable connected properly?
-
Go to Step 4
Go to Step 3
3
Repair as necessary.
Is the repair complete?
-
System OK
-
4
  1. Disconnect the cable at the door.
  2. Check the range of the door travel and the effort required to move it.
Does the door move freely through its entire range of the travel so that it can close at both ends of the range?
-
Go to Step 5
Go to Step 3
5
Check the travel of the cable by turning the control knob.
Is the cable travel OK?
-
Go to Step 6
Go to Step 7
6
  1. Reinstall the cable.
  2. Recheck the system using "Control settings/Correct Results" test in this procedure.
Does the system perform properly?
-
System OK
Go to Step 9
7
  1. Check the cable attachment at the control.
  2. Check for broken control.
Is there a problem with the cable attachment or the control?
-
Go to Step 8
Go to Step 9
8
Repair the cable attachment or control as necessary.
Is the repair complete?
-
System OK
Go to Step 9
9
Recheck the system using "Control settings/Correct
Results" test in this procedure.
Is the repair complete?
-
System OK
Go to Step 10
10
Check the airflow from the defroster or the vent outlets.
Is there high airflow from the defroster or the vent outlets?
-
Go to Step 11
Go to Step 12
11
Adjust the heater door at the floor and the vent door to get proper airflow.
Is the repair complete?
-
System OK
-
12
Switch the mode knob to defrost.
Is the defroster airflow OK?
-
Go to Step 13
Go to Step 14
13
  1. Remove the heater outlet.
  2. Check the heater outlet for obstructions.
  3. Remove any obstructions in the heater outlet.
Is the repair complete?
-
System OK
-
14
Check the blower speeds for change in the airflow.
Does the blower speed increase as the control is turned from 1 to 4?
-
Go to Step 15
15
  1. Check for obstructions in the system at the blower inlet.
  2. Remove any obstructions at blower inlet.
Is the repair complete?
-
System OK
Go to Step 16
16
  1. Set the blower on 4.
  2. Rotate the temperature control from hot to full cold.
  3. Listen for an airflow change.
Does the airflow change?
-
Go to Step 17
Go to Step 18
17
  1. Check the temperature door adjustments, the cables, the linkage, and the control.
  2. Adjust the temperature control to full hot.
Is the repair complete?
-
System OK
-
18
  1. Check the system for any obstruction between the blower and the system outlets.
  2. Remove any obstruction between the blower and the system outlets.
Is the repair complete?
-
System OK
-

TOO MUCH HEAT

Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
Set the mode switch to the floor position.
Is there too much heat when the mode switch is in the floor position?
-
Go to Step 3
Go to Step 9
3
Check for the defroster bleed.
Is there objectionable defroster bleed?
-
Go to Step 4
Go to Step 5
4
  1. Check the door travel, the cables, the controls, and the linkage for the heater and the defroster.
  2. Adjuster or repair, as required.
Is the repair complete?
-
System OK
-
5
  1. In vehicles equipped with air conditioning (A/C), set the A/C switch OFF.
  2. Set the blower speed to 4.
  3. Set the temperature control knob to full hot.
  4. Turn the ignition switch to ON.
  5. Start the engine.
  6. Check for airflow from the floor outlets.
  7. Check the floor outlet attachment.
Is the airflow high?
-
Go to Step 6
Go to Step 8
6
Check for a change in airflow at different blower speeds.
Does the airflow change as the setting for the blower speed switch is changed?
-
Go to Step 7
7
  1. Check the temperature door travel, the cable, and the linkage.
  2. Adjust to full hot.
  3. Check for full hot.
Is the repair complete?
-
System OK
-
8
Adjust or repair the floor/defroster and/or the vent/floor mode.
Is the repair complete?
-
System OK
-
9
Set the mode switch to the vent position.
Is the problem objectionable bleed?
-
Go to Step 10
Go to Step 15
10
  1. Check the system case for leaks.
  2. Check the floor outlet attachment.
Are there any problems?
-
Go to Step 11
Go to Step 12
11
Repair the system case or the floor outlet attachment as required.
Is the repair complete?
-
System OK
Go to Step 12
12
  1. Turn the ignition switch OFF.
  2. Turn the temperature control lever to full hot, then rapidly to full cold.
Did you hear the door slam just before you reached the end of the control travel?
-
Go to Step 13
Go to Step 14
13
Adjust the vent door to vent mode.
Is the repair complete?
-
System OK
-
14
  1. Check the temperature door travel, the cables, and the linkage.
  2. Verify the temperature door goes to full cold.
  3. Check the temperature door for full hot.
Is the temperature door travel correct?
-
System OK
-
15
  1. Set the intake air control to fresh air (indicator lamp OFF).
  2. Set the temperature control to full cold.
  3. Start the vehicle and allow the engine to warm up.
  4. Measure the air temperature at the blower inlet, or cowl, and at the vent air outlet inside the vehicle.
Is the outlet air more than 5°C (41°F) warmer than the inlet air?
-
Go to Step 16
System OK
16
  1. Check for hot air leaks from the engine compartment to the blower inlet.
  2. Repair as needed.
Is the repair complete?
-
System OK
-

CONTROLS

Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
Is excessive effort required to move the control?
-
Go to Step 5
Go to Step 3
3
Does a door move too easily on high blower setting?
-
Go to Step 4
System OK
4
  1. Replace the control cable.
  2. Add a loop to the cable routing to increase the effort required to move a control.
  3. Check for instrument panel interference with new cable routing.
Does the control operate properly?
-
System OK
Go to Step 5
5
Check the cable for improper routing, kinks, wiring interference, or other instrument panel interference.
Is any cable problem found?
-
Go to Step 6
Go to Step 7
6
Repair as needed.
Is the repair complete?
-
System OK
-
7
  1. Remove the cable from any door that binds on the cable.
  2. Cycle the door manually.
  3. Check for door binding.
Is there any door binding?
-
Go to Step 8
Go to Step 11
8
Check the door seal for proper installation.
Is the door seal OK?
-
Go to Step 9
Go to Step 10
9
  1. Check a binding door for shaft aligN-ment, a bent shaft, a bent door, or a warped case.
  2. Repair as need.
Is the repair complete?
-
System OK
-
10
Repair the door seal, as needed.
Is the repair complete?
-
System OK
-
11
Check the control binding.
Does the control bind?
-
Go to Step 13
Go to Step 12
12
  1. Reinstall the cable to the door.
  2. Check the clearance for the cable to dash compartments.
  3. Repair any interference.
Is the repair complete?
-
System OK
-
13
  1. Remove the cable from the control.
  2. Check the control for binding.
Does the control bind?
-
Go to Step 14
Go to Step 15
14
Replace the control.
Is the repair complete?
-
System OK
-
15
Replace the cable.
Is the repair complete?
-
System OK
-

BLOWER NOISE

Step Action Value(s) Yes No
1
Verify the customer's complaint.
Are the customer's concerns verified?
-
Go to Step 2
System OK
2
  1. Sit inside the vehicle.
  2. Close the doors and windows.
  3. Turn the ignition ON.
  4. Start the engine.
  5. Set the temperature to full cold.
  6. Cycle through the blower speeds, the modes, and the temperature settings in order to find the noise.
Is the blower noise constant at high blower speeds or in other modes?
-
Go to Step 11
Go to Step 3
3
Check for vibrations from the blower motor and fan assembly at each blower speed by feeling the blower motor housing.
Did you find excessive vibration?
-
Go to Step 6
Go to Step 4
4
  1. Remove the blower motor and fan assembly. Refer to "Blower Motor" in this section.
  2. Check for foreign materials at the opening of the blower inlet.
Did you find any foreign materials at the blower inlet?
-
Go to Step 5
Go to Step 6
5
Remove all foreign materials.
Is the repair complete?
-
System OK
Go to Step 6
6
  1. Examine the blower fan for wear spots, cracked blades, a cracked hub, a loose fan retaining nuts, or bad aligN·ment.
  2. 2. Examine the blower case for sports.
Did you find any problem?
-
Go to Step 7
Go to Step 9
7
Repair as required.
Is the repair complete?
-
System OK
Go to Step 8
8
Replace the motor and fan assembly.
Is the repair complete?
-
System OK
Go to Step 9
9
If the noise is a click/tick or whine, replace the motor.
Is the repair complete?
-
System OK
Go to Step 10
10
Reinstall the original motor.
Is the problem still present?
-
Go to Step 11
System OK
11
  1. Set the blower speed on 4.
  2. Check full hot to full cold temperature positions in the defroster, floor, and vent modes.
Is the noise present in the defrost mode only?
-
Go to Step 12
Go to Step 13
12
  1. Check the ducts for obstructions for foreign materials.
  2. Remove any obstructions or foreign materials.
  3. Check floor /defroster door seals.
  4. Repair or replace as needed.
Is the repair complete?
-
System OK
-
13
Is the noise present in the floor mode only?
-
Go to Step 12
Go to Step 14
14
Is the noise present in the vent mode only?
-
Go to Step 15
Go to Step 16
15
  1. Check the ducts for obstruction or foreign materials.
  2. Remove any obstructions or foreign materials.
  3. Check the vent door seals.
  4. Repair or replace as needed.
Is the repair complete?
-
System OK
-
16
Is the noise present in all modes, but not all temperature positions?
-
Go to Step 17
Go to Step 18
17
  1. Check the temperature door seals.
  2. Repair or replace as needed.
Is the repair complete?
-
System OK
-
18
  1. Check the system for obstructions for foreign materials between the fan and the temperature door.
  2. Repair or replace as needed.
Is the repair complete?
-
System OK
Go to Step 2

REPAIR INSTRUCTIONS

ON-VEHICLE SERVICE

MODE AND TEMPERATURE CONTROL CABLE ADJUSTMENT

Because the cables and the cable housing have fixed lengths, it is impossible to make a mode cable and temperature cable adjustment.
The heater/air distributor case linkage also cannot be adjusted.
If a malfunction is suspected, verify the proper operation of the controller and the mechanical doors for heater/air distributor case assembly.

UAA7A010
Display graphicTranslations of text in graphics


CONTROLLER ASSEMBLY AND CONTROL CABLES

Removal and Installation Procedure

  1. Disconnect the negative battery cable.
  2. Slide the cable eyelet off the post on the mode door lever (under the left side of I/P) and unsnap the clip that securing mode door control cable.
  3. Slide the cable eyelet off the post on the temperature door lever (under the right side of I/P) and un-snap the clip that securing temperature control cable.

    4. UAA7A020
    Display graphicTranslations of text in graphics


  4. Remove the heating and ventilation control (HVC) controller from instrument panel (I/P) by pushing back side of the controller.

    5. UAA7A030
    Display graphicTranslations of text in graphics


  5. Disconnect the electrical connectors.
  6. Remove the temperature control cable and mode control cable.
  7. Remove the controller assembly.
  8. Remove and replace temperature control cable or mode control cable as required.
  9. Installation should follow the removal procedure in the reverse order.

UAA7A040
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INTAKE AIR DOOR ACTUATOR

Removal and Installation Procedure

  1. Disconnect the negative battery cable.
  2. Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information.
  3. Remove passenger airbag if equipped.

    4. Caution : The sensing and diagnosis module (SDM) can maintain sufficient voltage to deploy the air-bags and pretensioner for one minute after the ignition is OFF and the fuse has been removed. If the airbags or pretensioners are not disconnected, do not begin service until one minute has passed after disconnecting power to the SDM. Otherwise, injury could result.

  4. Disconnect the connector to intake air control door actuator.
  5. Remove three screws that securing intake air control door actuator to blower unit.
  6. Remove the intake air control door actuator by gently snapping the actuator.
  7. Installation should follow the removal procedure in the reverse order.

UAA7A050
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HEATER/AIR DISTRIBUTOR CASE ASSEMBLY

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Drain the cooling system. Refer to Section 1D, Engine Cooling.
  3. Remove the inlet and outlet heater hoses from the firewall.
  4. Recover the refrigerant if air conditioning (A/C) system is equipped. Refer to Section 7B Manual Control Heating, Ventilation, and Air Conditioning System.

  5. Remove high pressure pipe and suction hose on the fire wall, if A/C system is equipped.
  6. Remove upper four bolts that securing heater/air distributor case assembly.
    7. Installation Notice
    Tightening Torque
    4 N•m (35 lb-in)

    UAA7A060
    Display graphicTranslations of text in graphics


  7. Lift the vehicle and remove lower two bolts that securing heater/air distributor case assembly.
    8. Installation Notice
    Tightening Torque
    4 N•m (35 lb-in)

    UAA7A070
    Display graphicTranslations of text in graphics


  8. Remove the instrument panel carrier assembly. Refer to Section 9E, Instrumentation/Driver Information.
  9. Remove one nut that securing heat/air distribution case.
    10. Installation Notice
    Tightening Torque
    4 N•m (35 lb-in)
  10. Remove the heater/air distribution case assembly.
  11. Installation should follow the removal procedure in the reverse order.
  12. Refill the coolant and refrigerant (if equipped A/C system).

UAA7A080
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BLOWER MOTOR

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information.
  3. Disconnect the blower motor electrical connector.
  4. Remove four screws that secure the motor to the heater/air distributor case. Do not remove the blower motor at this step.

    5. UAA7A090
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  5. Remove the cowl vent grill. Refer to Section 9R, Body Front End.
  6. Have an assistant to fix the blower fan at inside, remove the nut that securing the fan to blower motor.
    7. Installation Notice
    Tightening Torque
    2N•m(18 lb-in)

    UAA7A100
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  7. Holding the blower fan from outside, remove the blower motor.
  8. Remove the blower motor fan by reclining slightly.
  9. Installation should follow the removal procedure in the reverse order.
    10. Installation Notice
    After install the blower motor confirm that the blower motor operates properly.

UAA7A110
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BLOWER RESISTOR

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the glove box lower cover.
  3. Disconnect the electrical connector at the resistor.
  4. Remove two screws and remove the blower resistor.
  5. Installation should follow the removal procedure in the reverse order.

UAA7A120
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HEATER HOSES

Removal and Installation Procedures

  1. Partially drain the cooling system. Refer to Section 1D, Engine Cooling.
  2. Lift he vehicle.
  3. Slide rearward the heater hose clamps at the fire wall.
  4. Gently twist the hose from the left to right and back again to loosen the bond between the hose and the tube.
  5. Remove the end of the hose from the tube.

    6. UAA7A130
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  6. Remove the clamp and slide rearward the inlet heater hose at the engine block.
  7. Remove the inlet heater hose from the vehicle.

    8. UAA7A140
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  8. Remove the clamp and slide rearward the outlet heater hose.
  9. Remove outlet heater hose from the vehicle.
  10. Installation should follow the removal procedure in the reverse order.

UAA7A180
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HEATER CORE

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the heater/air distribution case from the vehicle. Refer to "Heater/Air Distribution Case Assembly" in this section.
  3. Remove the air mix door motor connector and wiring.
  4. Remove lower heater module cover and one clip inside.
  5. Remove seven screws and sealing sponges.

    6. Notice : Be careful while removing the sealing materials and replace if damaged.


    UAA7A190
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  6. Slowly separate the left and right heater module case and remove the heater core.
  7. Installation should follow the removal procedure in the reverse order.

UAA7A150
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SIDE VENTILATION DUCT

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to Section 9E, Instrumentation/Driver Information.
  3. Remove six screws and side ventilation duct.
  4. Installation should follow the removal procedure in the reverse order.

UAA7A160
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FRONT AIR DISTRIBUTION DUCT

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to Section 9E, Instrumentation/Driver Information.
  3. Remove four screws and front air distribution duct.
  4. Installation should follow the removal procedure in the reverse order.

UAA7A170
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FRONT WINDOW DEFROSTER DUCT

Removal and Installation Procedures

  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to Section 9E, Instrumentation/Driver Information.
  3. Remove nine screws and front window defroster duct.
  4. Installation should follow the removal procedure in the reverse order.

REAR HEATER DUCT

This vehicle is equipped with rear seat heater ducts. Should there be no airflow to the rear, look for any obstructions, such as items on the floor under the front seats. Also check for air leaks between the heater/air distributor assembly and the rear ducts.

SPECIFICATIONS

HEATER TEMPERATURE SPECIFICATIONS

Ambient Air Temperature
Heater Outlet Air Temperature
-18°C (0°F)
54°C (129°F)
-4°C (25°F)
59°C (138°F)
10°C (50°F)
64°C (147°F)
24°C (75°F)
68°C (154°F)

HEATER UNIT

Application
Description
Heating Capacity
7,425 - 9,075 kcal/h
Heater Core Size
200.4 × 168.2 × 25.0

FASTENER TIGHTENING SPECIFICATIONS

Application
N•m
Lb-Ft
Lb-In
Blower Fan-to-Blower Motor Nut
2
-
18
Heater/Air Distributor Case Retaining Bolt and Nut
4
-
35

SCHEMATIC AND ROUTING DIAGRAMS

NON-A/C DIAGRAM


U4A17A01
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