GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Ensure that all switches necessary to engage the A/C compressor are turned OFF.
  2. Disconnect the air conditoning (A/C) compressor clutch relay.

Does the A/C compressor clutch disengage?

--

Go to Step 3

Go to Step 2

2

Locate and repair the short to B + in CKT 59 (DK GRN) between the A/C compressor clutch connector, cavity A and the A/C compressor relay connector, cavity A.

Is the repair complete?

--

System OK

--

3

Connect a test light from the A/C compressor relay connector, cavity B 6 to ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

Locate and repair the short to B + in CKT 459 (DK GRN/WHT) between the A/C compressor relay connector, cavity B 6 and the body builder installed A/C control.

Is the repair complete?

--

System OK

--

5

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

Is the repair complete?

--

System OK

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