Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

Did you review the Air Delivery Description and Operation and the Air Temperature Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

1. Start the engine.
2. Turn the A/C switch to the OFF position.
3. Turn the blower switch to any position except OFF.

Does the A/C compressor clutch disengage?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Remove the A/C compressor clutch relay from the underhood fuse block.

Does the A/C compressor clutch disengage?

Go to Step 5

Go to Step 4

Repair the short to voltage in the A/C compressor clutch supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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Test the A/C compressor clutch relay. The switch should be normally open between terminals 1 and  3.

Did the relay test OK?

Go to Step 6

Go to Step 8

1. Turn the engine off.
2. Install the A/C compressor clutch relay.
3. Disconnect the A/C switch.

Does the A/C compressor clutch disengage?

Go to Step 9

Go to Step 7

Test the A/C compressor clutch relay control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the A/C compressor relay. Refer to Compressor Relay Replacement .

Did you complete the replacement?

Go to Step 11

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Replace the A/C switch. Refer to Heater and Air Conditioning Control Replacement .

Did you complete the replacement?

Go to Step 11

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Replace the powertrain control module (PCM). Refer to Powertrain Control Module Programming and Setup in Programming and Setup.

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3