why does my Toyota Highlander Third Generation (2014-2019) AC compressor keep cycling

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine turned off and cooled down.

2. Check Refrigerant Levels

• Tools Required: Manifold gauge set, refrigerant.
• Connect the manifold gauges to the high and low-pressure service ports.
• Start the engine and turn on the AC to the maximum setting.
• Read the pressures; if low, add refrigerant according to specifications.

3. Inspect for Leaks

• Tools Required: UV leak detection kit, dye, or soap solution.
• Apply UV dye to the AC system components and run the system.
• Use a UV light to locate any leaks or bubbles forming at connections.

4. Test and Replace AC Pressure Switch

• Tools Required: Multimeter, replacement pressure switch.
• Disconnect the AC pressure switch connector.
• Use a multimeter to check for continuity; replace if faulty.
• Reconnect the new pressure switch and ensure it is secured properly.

5. Check Compressor Functionality

• Tools Required: Socket set, torque wrench.
• Inspect the AC compressor for any physical damage or unusual noises.
• If the compressor clutch is not engaging properly, it may require replacement; follow manufacturer torque specifications during installation.

6. Verify Blend Door Operation

• Tools Required: Basic hand tools.
• Remove the dashboard trim or access panel to inspect the blend door actuator.
• Ensure it operates smoothly and does not bind; replace if defective.