my Toyota Highlander XU70 (2020-Present) AC is blowing warm air what to do

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the vehicle battery to ensure safety.

2. Check and Refill Refrigerant

• Tools Required: AC manifold gauge set, refrigerant.
• Locate the low-pressure service port on the AC system.
• Connect the low-pressure gauge to the service port.
• Check the pressure; if low, add refrigerant according to the manufacturer's specifications (usually R-134a for this model).
• Monitor the gauge while filling to avoid overcharging.

3. Inspect and Replace Cabin Air Filter

• Tools Required: Screwdriver or trim removal tool.
• Open the glove compartment and remove it to access the cabin air filter.
• Remove the old filter and inspect for dirt or blockages.
• Install a new, clean cabin air filter, ensuring it is oriented correctly.

4. Test AC Compressor

• Tools Required: Multimeter.
• Reconnect the vehicle battery.
• Start the engine and turn on the AC.
• Check for voltage at the AC compressor connector using a multimeter.
  • If voltage is present and the compressor doesn’t engage, replace the AC compressor.
  • If no voltage, trace the wiring back to the relay and switch to check for faults.

5. Check for Leaks

• Tools Required: UV dye and UV light (optional).
• If refrigerant was low, introduce UV dye into the system to check for leaks.
• Use a UV light to inspect hoses, connections, and the compressor for any signs of dye indicating a leak.