my Toyota RAV4 XA40 (2013-2018) AC is not blowing cold air what could be wrong

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety during electrical inspections.
• Allow the engine to cool before starting work.

2. Refrigerant Recharge

• Tools Required: Manifold gauge set, refrigerant (R-134a).
• Sub-steps:
  1. Connect the low-pressure side of the manifold gauge set to the AC service port.
  2. Start the engine and turn the AC to the maximum setting.
  3. Monitor the pressure readings; if low, add refrigerant until the correct level is achieved according to manufacturer specifications (typically around 28-40 psi for low side).
  4. Check for any signs of leakage during the process.

3. AC Compressor Inspection

• Tools Required: Socket set, multimeter.
• Sub-steps:
  1. Locate the AC compressor and inspect for any physical damage or oil leaks.
  2. Use a multimeter to check for voltage at the compressor connector when the AC is activated.
  3. If no voltage is detected, further diagnose the wiring and relay.
  4. If voltage is present and the compressor does not engage, replace the compressor.

4. Fuse and Relay Check

• Tools Required: Multimeter or test light.
• Sub-steps:
  1. Locate the fuse box and identify the AC fuse and relay.
  2. Use a multimeter to test the fuse for continuity; replace if blown.
  3. Test the relay by swapping it with a similar relay in the fuse box; if the AC works with the swapped relay, replace the faulty relay.

5. Cabin Air Filter Replacement

• Tools Required: Screwdriver or trim removal tool.
• Sub-steps:
  1. Locate the cabin air filter housing (usually behind the glove box).
  2. Remove the screws or clips securing the housing and take out the old filter.
  3. Install a new cabin air filter according to the flow direction indicated on the filter.
  4. Reassemble the housing securely.