why does my Toyota Highlander Fourth Generation (2020-present) AC only blow warm air

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent any electrical shorts during work.

2. Recharge Refrigerant

• Tools Required: Manifold gauge set, refrigerant canister, AC service hose.
• Connect the manifold gauges to the low and high-pressure ports of the AC system.
• Start the engine and turn the AC to maximum cooling with the blower set to high.
• Check the pressure readings on the gauges; if low, proceed to recharge the system.
• Open the refrigerant canister valve and allow refrigerant to flow into the system until proper pressure is reached (refer to manufacturer's specifications for pressure levels).

3. Replace AC Compressor (if necessary)

• Tools Required: Socket set, torque wrench, serpentine belt tool.
• Remove the serpentine belt by releasing tension from the tensioner pulley.
• Disconnect the electrical connector from the AC compressor and remove the refrigerant lines (ensure to recover refrigerant properly).
• Unbolt the AC compressor from its mounting bracket and remove it from the engine bay.
• Install the new AC compressor by reversing the removal steps, ensuring all bolts are tightened to the manufacturer's torque specifications.

4. Inspect and Replace Cabin Air Filter

• Tools Required: None.
• Locate the cabin air filter compartment (usually behind the glove box).
• Open the glove box and remove any necessary panels to access the filter.
• Remove the old cabin air filter and install the new one, ensuring it is oriented correctly.

5. Final Assembly

• Reconnect all electrical connections and refrigerant lines.
• Reinstall the serpentine belt.
• Reconnect the battery.