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 MANUALSCHEVROLET2002EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGHEATER CORESERVICE AND REPAIRHEATER CORE REPLACEMENT
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Heater Core Replacement
2002 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Heater Core Replacement
REMOVAL PROCEDURE
1. Drain the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
2. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging.
3. Remove the coolant recovery reservoir or the surge tank.
4. Remove the battery from the vehicle.
5. Remove the A/C accumulator.
6. Remove the heater hoses from the heater core.
7. Remove the screws from the heater case.
8. CAREFULLY open the heater core access door in order to cut the heater core access door.
9. Cut the marked section of the heater core access door.
10. Remove the retainers from the heater core.
11. Remove the heater core from the vehicle.
INSTALLATION PROCEDURE
1. Install the heater core to the vehicle.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the retainers to the heater core.
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
3. Install the heater core access door.
4. Install the retaining screws into the heater case.
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
5. Install the heater hoses to the heater core.
6. Install the A/C accumulator.
7. Install the battery to the vehicle.
8. Install the coolant recovery reservoir or the surge tank.
9. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
10. Fill the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
1. Drain the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
2. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging.
3. Remove the coolant recovery reservoir or the surge tank.
4. Remove the battery from the vehicle.
5. Remove the A/C accumulator.
6. Remove the heater hoses from the heater core.
7. Remove the screws from the heater case.
8. CAREFULLY open the heater core access door in order to cut the heater core access door.
9. Cut the marked section of the heater core access door.
10. Remove the retainers from the heater core.
11. Remove the heater core from the vehicle.
INSTALLATION PROCEDURE
1. Install the heater core to the vehicle.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the retainers to the heater core.
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
3. Install the heater core access door.
4. Install the retaining screws into the heater case.
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
5. Install the heater hoses to the heater core.
6. Install the A/C accumulator.
7. Install the battery to the vehicle.
8. Install the coolant recovery reservoir or the surge tank.
9. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
10. Fill the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
RENDER: 1.0x
NO RELATED
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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.