how to fix the AC not blowing cold air in my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Recharge the AC System

• Tools Required: AC refrigerant kit, manifold gauge set.
• Sub-steps:
  1. Reconnect the battery terminal.
  2. Attach the low-pressure side gauge from the manifold gauge set to the service port on the AC system.
  3. Check the current pressure. If it’s low, proceed to recharge.
  4. Connect the refrigerant can to the manifold gauge.
  5. Start the engine and turn on the AC to the maximum setting.
  6. Open the valve on the refrigerant can and let the system draw in refrigerant until the correct pressure is reached (refer to manufacturer specifications).

3. Replace the Cabin Air Filter

• Tools Required: Screwdriver, replacement cabin air filter.
• Sub-steps:
  1. Locate the cabin air filter compartment, usually behind the glove box.
  2. Remove the screws or clips to access the filter.
  3. Take out the old filter and insert the new one, ensuring the airflow direction is correct.
  4. Reassemble the compartment.

4. Inspect and Replace AC Relay/Fuses (if necessary)

• Tools Required: Multimeter, replacement relay/fuses.
• Sub-steps:
  1. Locate the fuse box and find the AC relay and fuse.
  2. Use a multimeter to check for continuity in the relay and fuse.
  3. If faulty, remove the old relay/fuse and replace it with a new one.