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 MANUALSCHEVROLET2012EXPRESS 3500 V8-4.8LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGHOUSING ASSEMBLY HVACSERVICE AND REPAIRAIR CONDITIONING (A/C) EVAPORATOR AND BLOWER MODULE ASSEMBLY REPLACEMENT
2012 Chevrolet Express 3500 V8-4.8L
Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement
2012 Chevrolet Express 3500 V8-4.8LSECTION Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement
Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement
Special Tools
J 39400-A Halogen Leak Detector
Removal Procedure
1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.
2. Remove the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement Coolant Recovery Reservoir Replacement.
3. Disconnect the low pressure sensor electrical connector (2).
4. Disconnect the blower motor assembly electrical connector.
5. Disconnect the blower motor resistor assembly electrical connector.
6. Remove the retaining nut (1) from the evaporator inlet tube.
7. Remove the evaporator inlet tube retaining screw.
8. Remove the evaporator inlet tube from the evaporator.
9. Remove the O-ring seal.
10. Remove the retaining nut (1) from the accumulator.
11. Remove the accumulator from the evaporator.
12. Remove the O-ring seal.
13. Remove the blower module assembly screws.
14. Remove the blower module assembly.
15. Remove the heater assembly. Refer to Heater Assembly Replacement Service and Repair.
16. Remove the module assembly nuts (5).
17. Remove the module assembly nuts (2).
18. Remove the module from the vehicle.
Installation Procedure
1. Install the module from the vehicle.
Caution:
Refer to Fastener Caution Fastener Caution.
2. Install the module assembly nuts (2) and tighten to 6 Nm (53 lb in).
3. Install the module assembly nuts (5) and tighten to 6 Nm (53 lb in).
4. Install the heater assembly. Refer to Heater Assembly Replacement Service and Repair.
5. Install the evaporator and blower module assembly.
6. Install the evaporator and blower module assembly retaining screws.
7. Install new O-ring seals. Refer to Air Conditioning O-Ring Seal Replacement Air Conditioning O-Ring Seal Replacement.
8. Install the accumulator to the evaporator.
9. Install the accumulator retaining nut (1) and tighten to 18 Nm (13 lb ft).
10. Install the evaporator inlet tube to the evaporator.
11. Install the evaporator inlet tube retaining nut (1) and tighten to 16 Nm (12 lb ft).
12. Install the evaporator inlet tube retaining screw.
13. Connect the blower motor resistor assembly electrical connector.
14. Connect the blower motor assembly electrical connector.
15. Connect the low pressure sensor electrical connector (2).
16. Install the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement Coolant Recovery Reservoir Replacement.
17. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.
18. Leak test the fittings of the components using the J 39400-A.
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.