how to fix the AC not blowing cold air in my Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

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

2. Inspect and Replace AC Compressor

• Locate the AC compressor under the hood.
• Tools Required: Socket set, torque wrench, refrigerant recovery machine (if necessary).
• Sub-steps:
  1. Remove any obstructing components to access the AC compressor.
  2. Disconnect the electrical connector from the compressor.
  3. Use the socket set to remove the mounting bolts from the compressor.
  4. Carefully pull the compressor out of its mounting position.
  5. If replacing, install the new compressor by reversing the removal steps and ensuring proper torque specifications (typically around 20-30 ft-lbs).

3. Recharge the AC System

• After the compressor is installed, recharge the AC system.
• Tools Required: Manifold gauge set, refrigerant.
• Sub-steps:
  1. Connect the manifold gauge set to the low and high-pressure ports of the AC system.
  2. Open the valves on the manifold gauge and start the vehicle.
  3. Introduce the correct type and amount of refrigerant (typically R-134a) as specified in the vehicle's manual.
  4. Monitor the gauges to ensure the system reaches appropriate operating pressures.

4. Test the AC System

• Reconnect the battery.
• Start the vehicle and turn on the AC to the coldest setting.
• Sub-steps:
  1. Observe the AC compressor operation and listen for any unusual noises.
  2. Monitor the temperature of the air blowing from the vents to ensure it is cold.