Did you review the HVAC Compressor/Condenser Fan Circuit Description and perform the necessary inspections?

Go to Step 2

Go to Diagnostic Starting Point - HVAC Systems - Manual

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

Does the compressor clutch disengage?

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

Go to Step 3

Disconnect the A/C compressor clutch relay.

Does the compressor clutch disengage?

Go to Step 7

Go to Step 4

Test for a short to voltage in the WHT/RED wire between the A/C compressor clutch relay and the A/C compressor clutch.

Does a short to voltage exist?

Go to Step 5

Go to Step 6

Repair the short to voltage in the WHT/RED wire between the A/C compressor clutch relay and the A/C compressor clutch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

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Replace the A/C compressor clutch. Refer to Compressor Clutch Coil Replacement .

Is the repair complete?

Go to Step 16

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1. Reconnect the A/C compressor clutch relay.
2. Turn the ignition switch to LOCK.
3. Disconnect the A/C compressor control module connector.
4. Turn the ignition switch to ON.

Does the A/C compressor clutch engage?

Go to Step 8

Go to Step 11

Test for a short to ground in the PNK wire between the A/C compressor clutch relay and the A/C compressor control module.

Does a short to ground exist?

Go to Step 9

Go to Step 10

Repair the short to ground in the PNK wire between the A/C compressor clutch relay and the A/C compressor control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

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

Is the repair complete?

Go to Step 16

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1. Set the A/C switch to OFF.
2. Set the mode to VENT (this opens the defrost switch).
3. Test for a short to ground in the GRN/BLK wire between the A/C compressor control module connector cavity 10 and the A/C switch connector cavity 3.
4. Test for a short to ground in the GRN/BLK wire between the A/C compressor control module connector cavity 10 and the defrost switch.

Is a short to ground present?

Go to Step 12

Go to Step 13

Repair the short. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 16

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1. Set the A/C switch to OFF.
2. Set the mode to VENT (this opens the defrost switch).
3. Test the A/C switch for continuity between terminals 2 and 3.
4. Test the defrost switch for continuity between terminals 1 and 2.

Is continuity present (switch shorted) in either switch?

Go to Step 14

Go to Step 15

Replace the A/C switch or the defrost switch. Refer to Control Assembly Replacement .

Is the repair complete?

Go to Step 16

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Replace the A/C compressor control module. Refer to Air Conditioning (A/C) Compressor Control Module Replacement .

Is the repair complete?

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3