Schematic Reference: HVAC Schematics

DEFINITION: Temperature can not be adjusted, or cooling insufficient during A/C operation.

1

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

1. Turn ON the ignition, with the engine OFF.
2. Place the mode switch in any position except OFF.
3. Place the blower motor switch in each speed position.

Does the blower motor operate at all?

Go to Step 3

Go to Blower Motor Inoperative

Does the blower motor operate correctly for each speed position?

Go to Step 4

Go to Blower Motor Malfunction

Does the Too Hot in Vehicle concern occur when A/C cooling is desired?

Go to Step 5

Go to Step 7

Important: For A/C compressor operation, ambient air temperature must be above 3°C (38°F).

1. Start the engine.
2. Place the blower motor switch in the maximum speed position.
3. Place the mode switch in the MAX position.
4. Place the temperature switch in the coldest position.

Does the A/C compressor operate?

Go to Step 6

Go to HVAC Compressor Clutch Does Not Engage

6

Perform the refrigerant system performance test. Refer to Air Conditioning (A/C) System Performance Test in Heating Ventilation and Air Conditioning.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

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

Did you find and correct the condition?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2