Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The temperature cannot be adjusted, or the heating is insufficient.

1

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

1. Turn the ignition ON, with the engine OFF.
2. Place the blower switch in each speed position.

Does the blower motor operate in any of the speed positions?

Go to Step 3

Go to Blower Motor Inoperative

Does the blower motor operate at the desired speeds?

Go to Step 4

Go to Blower Motor Malfunction

1. Start the engine.
2. Place the blower motor switch in the maximum speed position.
3. Lower the glove box off its upper attachments.
4. Observe the recirculation door.
5. Place the recirculation switch in the ON position.

Does the recirculation door move to the recirculation position?

Go to Step 5

Go to Air Recirculation Malfunction

Place the blower motor switch to the OFF position.

Does the A/C compressor operate?

Go to HVAC Compressor Clutch Does Not Disengage

Go to Step 6

Inspect the cooling system for the following conditions:

Did you find and correct the condition?

Go to Step 9

Go to Step 7

Perform the Heating Performance Diagnostic. Refer to Heating Performance Diagnostic in Heating, Ventilation and Air Conditioning.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

Inspect the air temperature door and linkage for the following conditions:

Did you find and correct the condition?

Go to Step 9

Go to High or Low Temperature Control Effort in Heating, Ventilation and Air Conditioning

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2