GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the HVAC System Check performed?

--

Go to Step 2

Go to HVAC System Check

2

  1. Turn the ignition switch to the ON position.
  2. Press the A/C switch to ON.
  3. Turn the blower speed selector switch to any position except OFF.
  4. Disconnect the A/C condenser fan connector.
  5. Connect a test lamp from connector cavity 1 to cavity 2.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

Replace the A/C condenser fan. Refer to Condenser Fan Replacement .

Is the repair complete?

--

Go to HVAC System Check

--

4

Connect a test lamp from cavity 1 of the A/C condenser fan connector to ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Repair the open in the BLK ground wire between the A/C condenser fan and G108. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to HVAC System Check

--

6

Backprobe the A/C condenser fan relay connector with a test lamp from cavity 4 to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

7

Repair the open in the BLU/BLK wire between the A/C condenser fan relay and the A/C condenser fan. Refer to Wiring Repairs in Wiring Systems.

is the repair complete?

--

Go to HVAC System Check

--

8

  1. Disconnect the A/C condenser fan relay connector.
  2. Connect a test lamp from connector cavity 3 to B+.

Does the test lamp light?

--

Go to Step 9

Go to Step 12

9

Test for an open in the YEL or RED wire that leads to the A/C condenser fan relay.

Does an open exist?

--

Go to Step 10

Go to Step 11

10

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

Is the repair complete?

--

Go to HVAC System Check

--

11

Replace the A/C condenser fan relay. Refer to Condenser Fan Relay Replacement .

Is the repair complete?

--

Go to HVAC System Check

--

12

Backprobe the A/C compressor control module connector with a test lamp from cavity 6 to B+.

Does the test lamp light?

--

Go to Step 13

Go to Step 14

13

Repair the open in the BLU/RED wire between the A/C compressor control module and the A/C condenser fan relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to HVAC System Check

--

14

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

Is the repair complete?

--

Go to HVAC System Check

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