Note: This procedure requires specialized tools, including an A/C recovery machine and vacuum pump. It's recommended to consult a professional for this task unless you have adequate training and experience.
1. Retrieve Refrigerant: Use an A/C recovery machine to extract the refrigerant from the A/C system.
2. Disconnect and Remove Components:
- Disconnect the battery to ensure electrical safety.
- Remove the glove compartment to gain access.
- Remove or loosen necessary trim panels and components.
3. Detach Evaporator Core:
- Locate and disconnect the evaporator core inlet and outlet lines.
- Unbolt and remove the evaporator core housing from the HVAC unit.
- Extract the old evaporator core from the housing.
4. Replace Evaporator Core:
- Place the new evaporator core inside the housing.
- Reattach the evaporator core housing.
- Reconnect the inlet and outlet lines.
5. Recharge System:
- Reconnect the battery.
- Connect an A/C vacuum pump to the system and evacuate any air.
- Recharge the system with the specified amount of refrigerant.
6. Perform Leak Test:
- Pressurize the system using nitrogen and check for leaks using a leak detector.
7. Test the A/C System:
- Turn on the engine and ensure the A/C is functioning properly.
Important Notes:
- The exact procedure may vary slightly based on the specific Tahoe model and trim. Refer to a reliable repair manual for your specific vehicle model.
- The A/C system operates under high pressure, and safety precautions should be followed to prevent injury or damage.
- Refrigerant is hazardous and should be handled and disposed of properly in accordance with local regulations.
- It's recommended to replace the receiver-drier and expansion valve along with the evaporator core to ensure the efficiency of the system.
