How to Replace a Refrigerant Pressure Sensor

The refrigerant pressure sensor, or switch, is designed to protect the A/C system against incorrect refrigerant pressure. There are low-pressure cutout sensors and high-pressure cutout sensors. The low-pressure cutout sensor can be found on either the high or low side of the system and is used to disengage the compressor clutch if pressure gets too low.

On the other hand, the high-pressure cutout sensor is typically located on the high side of the A/C system and is used to disengage the compressor if pressure gets too high. The most common symptom of a failed refrigerant pressure sensor is A/C that doesn’t work or works intermittently, but you may also notice that it blowers warm air.

Part of 1 of 1: Replacing the refrigerant pressure sensor

Materials Needed

  • Repair manuals
  • Protective gloves
  • Safety glasses
  • Wrench of the appropriate size

refrigerant pressure sensor

Step 1: Locate the refrigerant pressure sensor. The refrigerant pressure sensor is typically mounted to the A/C pressure line, compressor, or accumulator/drier.

disconnect the negative battery cable

Step 2: Disconnect the negative battery cable. Disconnect the negative battery cable with a wrench of ratchet and set it aside.

removing the electrical connector

Step 3: Remove the sensor electrical connector.

unscrewing the sensor

Step 4: Remove the sensor. Use a wrench to loosen the sensor, and then unscrew it.

  • Note: In most cases there is a schrader valve built into the sensor mount. Because of this, the A/C system does not need to be evacuated prior to sensor removal. However, it’s a good idea to consult the factory repair information for your vehicle before removing the switch.

installing the new sensor

Step 5: Install the new sensor. Screw in the new sensor in by hand, and then tighten it down using a wrench.

reinstalling the electrical connector

Step 6: Reinstall the electrical connector.

Step 7: Reinstall the negative battery cable. Reinstall the negative battery cable and tighten it.

You should now have a working AC system to keep you comfortable on the road. If this sounds like a job you’d rather leave to a professional or if you don’t feel confident completing the repair yourself, have one of YourMechanic’s certified technicians perform a refrigerant pressure sensor replacement.


Next Step

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Scott

34 years of experience
539 reviews
Scott
34 years of experience
Subaru Legacy H4-2.2L - Axle / CV Shaft Assembly Replacement (Driver Side Front) - Denver, Colorado
did a great job, and was willing to explain what he was doing
Hyundai Elantra - Trunk Latch Release Cable - Denver, Colorado
Scott showed up on time and replaced my cable expertly.

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20 years of experience
402 reviews
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20 years of experience
Toyota Camry L4-2.5L - Oil Change - Redwood City, California
Khoa was very kind and honest. He listened to what I had to say and did not push extra services on me. I asked several questions and he was very patient. Thank you Khoa!

Scott

36 years of experience
892 reviews
Scott
36 years of experience
BMW 330Ci L6-3.0L - Control Arm Assembly Replacement (Rear Lower Left) - Chandler, Arizona
I am new here from Seattle and figured I would try this company. Scott was great! Contacted me on the way and showed up on time with the correct parts. Scott did an incredible job replacing a broken suspension part, did the job right and for the quoted amount. He was very personable to talk to and answered all my questions. I will definitely hire Scott again, and recommend him to all my frinds and family!

David

11 years of experience
225 reviews
David
11 years of experience
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