why does my Toyota Camry XV40 (2007-2011) AC stop working when it’s hot?

Solution

1. Preparation

• Tools Needed: OBD-II scanner, manifold gauge set, UV dye, electronic leak detector, socket set, and multimeter.
• Safety Warning: Disconnect the battery to prevent electrical shocks and ensure the vehicle is cool before working on the AC system.

2. Check and Replace Refrigerant

• Sub-steps:
  1. Connect the manifold gauge set to the low and high-pressure service ports.
  2. Check the pressure readings against manufacturer specifications.
  3. If low, evacuate the system using a vacuum pump to remove moisture and air.
  4. Recharge the AC system with the correct type and amount of refrigerant (typically R-134a).

3. Inspect and Replace AC Compressor

• Sub-steps:
  1. Remove the serpentine belt from the AC compressor.
  2. Disconnect electrical connectors and refrigerant lines (ensure refrigerant is safely recovered).
  3. Unbolt the AC compressor from its mounting bracket.
  4. Install the new compressor, ensuring proper alignment and torque specifications.
  5. Reconnect refrigerant lines and electrical connectors.

4. Replace Cabin Air Filter

• Sub-steps:
  1. Locate the cabin air filter access panel (usually behind the glove compartment).
  2. Remove the panel and take out the old filter.
  3. Install the new filter, ensuring the airflow direction is correct.
  4. Reattach the access panel.