my Toyota Highlander XU70 (2020-Present) AC is blowing hot air, what should I check

Solution

1. Preparation

• Gather tools: manifold gauge set, OBD-II scanner, multimeter, socket set, and a flashlight.
• Ensure the vehicle is parked on a level surface with the engine off and cool before starting the repair.

2. Recharge the AC System (if low refrigerant is detected)

1. Connect the manifold gauge set to the AC service ports (low and high).
2. Start the engine and set the AC to maximum setting.
3. Check the pressure readings; if low, proceed to add refrigerant:
   • Use R-134a refrigerant as specified by the manufacturer.
   • Open the low side valve on the manifold gauge to add refrigerant until the correct pressure is reached (typically around 30-40 PSI for low side).
4. Close the valve and disconnect the manifold gauge.

3. Repair or Replace AC Compressor (if damaged)

1. Disconnect the battery before working on electrical components.
2. Remove the front grille and any necessary components obstructing access to the AC compressor.
3. Disconnect the AC lines from the compressor using the appropriate wrench.
4. Unplug the electrical connector from the compressor.
5. Remove the mounting bolts securing the compressor and take out the compressor.
6. Install the new or repaired compressor by reversing the removal steps. Ensure all seals are replaced and tightened to manufacturer specifications.

4. Replace Cabin Air Filter (if obstructed)

1. Locate the cabin air filter housing; usually under the glove compartment.
2. Remove the clips or screws securing the housing cover.
3. Pull out the old filter and inspect it for dirt or debris.
4. Insert the new cabin air filter ensuring it is oriented correctly.
5. Reattach the housing cover and secure it with clips or screws.