GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Compressor Clutch Does Not Engage

Step

Action

Value(s)

Yes

No

1

Verify the ambient temperature displayed on the HVAC control assembly is greater than 41°F (5°C).

Are any PCM DTCs stored?

--

Go to DTC Table

Go to Step 2

2

Inspect the A/C compressor clutch coil connector.

Is the connector loose or disconnected?

--

Go to Step 3

Go to Step 4

3

Connect or repair the A/C compressor clutch coil connector. Refer to Repairing Connector Terminals in Wiring Systems.

Does the A/C compressor operate?

--

System OK

Go to Step 4

4
  1. Turn the engine OFF.
  2. Attempt to rotate the A/C compressor clutch by hand.

Is the compressor seized?

--

Go to Step 6

Go to Step 5

5

Test the operation of the A/C compressor clutch by connecting a fused jumper wire between the B+ terminal and the clutch coil terminal A. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the clutch engage?

--

Go to Step 7

Go to Step 8

6

Replace the A/C compressor assembly. Refer to Air Conditioning Compressor Replacement .

Is the repair complete?

--

System OK

--

7
  1. Remove the jumper wire.
  2. Examine the system low-side pressure.

Is the pressure reading more than the specified value?

310 kPa (45 psi)

Go to Step 14

Go to Step 11

8

Connect a fused jumper wire from good ground to the A/C compressor clutch coil terminal B. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the clutch engage?

--

Go to Step 10

Go to Step 9

9

Replace the A/C compressor clutch coil. Refer to Compressor Clutch Coil Removal (V5 - Conventional Mount) .

Is the repair complete?

--

System OK

--

10

Repair the ground circuit problem. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

11

Examine the system high-side pressure.

Is the pressure reading more than the specified value?

310 kPa (45 psi)

Go to Step 12

Go to Step 13

12
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Inspect for a plugged expansion tube or a high-side restriction. Refer to Expansion (Orifice) Tube Replacement .
  3. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

--

System OK

--

13

The refrigerant charge is insufficient.

  1. Perform a leak test. Refer to Leak Testing .
  2. Perform any necessary repairs.
  3. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

--

System OK

--

14
  1. Turn the ignition switch to the RUN position.
  2. Select the AUTO mode.
  3. Disconnect the low side temperature sensor connector.
  4. Connect the fused jumper wire between the switch connector terminals. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the clutch engage?

--

Go to Step 15

Go to DTC Table

15

Replace the low side temperature sensor. Refer to Temperature Sensor Replacement - Low Side .

Is the repair complete?

--

System OK

--