my Toyota Highlander Fourth Generation (2020-present) air conditioning is blowing warm air what’s wr...

Solution

1. Preparation

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

2. Recharge Refrigerant

1. Connect Refrigerant Gauge: Attach the refrigerant gauge to the low-pressure port of the AC system.
2. Check Pressure: Determine if the refrigerant level is low; if so, proceed to recharge.
3. Add Refrigerant: Following manufacturer specifications, add the appropriate refrigerant type (usually R-134a or R-1234yf) until proper pressure is achieved.
4. Check for Leaks: Use a leak detector or soapy water on connections to confirm there are no leaks.

3. Replace Cabin Air Filter

1. Locate Filter: Access the cabin air filter, typically behind the glove compartment.
2. Remove Glove Compartment: Carefully detach the glove compartment to access the filter.
3. Replace Filter: Remove the old filter and install a new one, ensuring proper orientation.
4. Reassemble: Reattach the glove compartment.

4. Inspect and Replace AC Compressor

1. Visual Inspection: Check for any visible damage to the AC compressor and associated belts.
2. Remove Compressor: Disconnect the refrigerant lines (ensure all refrigerant is recovered properly) and unbolt the compressor from its mount.
3. Install New Compressor: Position the new compressor and secure it with bolts to manufacturer specifications.
4. Reconnect Lines: Reattach the refrigerant lines and ensure all connections are tight.

5. Test AC System

1. Reconnect Battery: Reconnect the battery after completing repairs.
2. Run Engine: Start the vehicle and set the AC to maximum cooling.
3. Monitor Performance: Check for cold air output and ensure the compressor is cycling correctly.