Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1998ENVOY 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACCOMPRESSOR CONTROL VALVE ASSEMBLYSERVICE AND REPAIR
1998 GMC Envoy 2WD V6-4.3L VIN W
Compressor Control Valve Assembly: Service and Repair
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Service and Repair
Tools Required
J 41790 Compressor Holding Fixture
Removal Procedure
1. Remove the compressor from the vehicle.
2. Clamp the compressor holding fixture, J41790 in a vise and attach the compressor to the J41790.
3. Using internal snap ring pliers, remove the compressor control valve retaining ring.
4. Remove the compressor control valve from the compressor.
Installation Procedure
1. Coat the control valve O-rings with clean 525 viscosity refrigeration oil.
2. Push the compressor control valve into the compressor with thumb pressure.
3. Using internal snap ring pliers install the compressor control valve retaining ring. Make sure the retaining ring is properly seated in the ring groove.
4. Remove the compressor from the J 41790.
5. Install the compressor into the vehicle.
J 41790 Compressor Holding Fixture
Removal Procedure
1. Remove the compressor from the vehicle.
2. Clamp the compressor holding fixture, J41790 in a vise and attach the compressor to the J41790.
3. Using internal snap ring pliers, remove the compressor control valve retaining ring.
4. Remove the compressor control valve from the compressor.
Installation Procedure
1. Coat the control valve O-rings with clean 525 viscosity refrigeration oil.
2. Push the compressor control valve into the compressor with thumb pressure.
3. Using internal snap ring pliers install the compressor control valve retaining ring. Make sure the retaining ring is properly seated in the ring groove.
4. Remove the compressor from the J 41790.
5. Install the compressor into the vehicle.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.