GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Vivant 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Compressor Clutch Does Not Engage

Step

Action

Values

Yes

No

1
  1. Disconnect the compressor magnetic clutch connector.
  2. Turn ON the ignition.
  3. Turn the A/C on.
  4. Measure the voltage between compressor magnetic clutch connector and ground.

Does the voltage measure within the specified value?

11-14 V

Go to Step 2

Go to Step 3

2

Repair the compressor magnetic clutch or replace the compressor assembly.

Did you complete the repair?

--

System OK

--

3

Inspect the fuse EF24.

Is the fuse open?

--

Go to Step 4

Go to Step 5

4

Repair the short circuit between fuse EF24 and terminal 1 of compressor magnetic clutch connector.

Did you complete the repair?

--

System OK

--

5
  1. Turn ON the ignition.
  2. Measure voltage at the following terminals and ground.
    3. • Terminal 87 of A/C compressor relay
    • Terminal 85 of A/C compressor relay

Do both voltages measure within the specified value?

11-14 V

Go to Step 9

Go to Step 6

6

Do both voltages measure equal to specified value?

0 V

Go to Step 7

Go to Step 8

7
  1. Inspect fuse F17 in the I/P fuse block.
  2. If blown, repair any short wire and replace the fuse.
  3. Inspect the wire from fuse F17 to terminal 86 of A/C compressor relay and repair or replace as needed.

Did you complete the repair?

--

System OK

--

8

Inspect the terminal of compressor relay and replace it as needed.

Did you complete the repair?

--

System OK

--

9
  1. Turn OFF the ignition.
  2. Measure the resistance between terminal 87 of A/C compressor relay and magnetic terminal 1 of A/C compressor clutch.

Does the resistance measure equal to specified value?

0 ohms

Go to Step 11

Go to Step 10

10

Repair the open circuit.

Did you complete the repair?

--

System OK

--

11
  1. Disconnect the connector of compressor magnetic clutch.
  2. Measure the resistance between terminal 2 of A/C compressor magnetic clutch and ground.

Does the resistance measure within the specified value?

0 ohms

Go to Step 13

Go to Step 12

12

Repair the open circuit between terminal 2 of the A/C compressor magnetic clutch and ground.

Did you complete the repair?

--

System OK

--

13
  1. Turn OFF the ignition.
  2. Measure the resistance between terminal 85 of A/C compressor relay and following ECM terminal.
    3. • Terminal K29 for 2.0L (MR-140)
    • Terminal A15 for 2.0L (ITMS-6)
    • Terminal 41 for 1.6D (SIRIUS D4)

Does the resistance measure equal to specified value?

0 ohms

Go to Step 15

Go to Step 14

14

Repair the open circuit.

Did you complete the repair?

--

System OK

--

15

Replace the ECM.

Did you complete the replacement?

--

System OK

--