How to Replace an AC Pressure Switch

Air conditioning pressure switches are designed to protect the A/C system against pressure that is too high or too low. There are both high pressure and low pressure switches; some vehicles are equipped with just a high pressure switch while others have both. Incorrect pressure can damage the compressor, hoses, and other A/C system components.

The A/C pressure switch is a type of device called a transducer, which changes internal resistance in response to changes in pressure. The clutch cycling switch measures A/C pressure near the evaporator outlet, and is often mounted on the accumulator. If the incorrect pressure is sensed, the switch will open the A/C compressor clutch circuit to prevent operation. Once the necessary repairs are made to bring the pressure into specification, the switch will allow normal clutch operation.

The most common symptom of a failed A/C pressure switch is an inoperative compressor and lack of A/C.

Part 1 of 3: Locate the A/C clutch cycling switch

In order to safely and efficiently replace your A/C pressure switch you need a couple of basic tools:

locating the pressure switch

Step 1: Locate the A/C pressure switch. The pressure switch can be mounted to A/C pressure line, compressor or accumulator/drier.

Part 2 of 3: Remove the A/C pressure switch

disconnecting the negative battery cable

Step 1: Disconnect the negative battery cable. Disconnect the negative battery cable with a wrench of ratchet. Then set it aside.

removing the electrical connector

Step 2: Remove the switch electrical connector.

unscrewing the switch

Step 3: Remove the switch. Loose the switch with a socket or wrench, then unscrew it.

  • Note: Typically, the A/C system does not need to be evacuated prior to removing the A/C pressure switch. This is because there is a schrader valve built into the switch mount. If you have any doubt as to the design of your system, consult the factory repair information before switch removal.

Part 3 of 3: Install the A/C clutch cycling switch

installing new switch

Step 1: Install the new switch. Screw in the new switch, then tighten it until it’s snug.

replace an ac pressure switch

Step 2: Reinstall the electrical connector.

Step 3: Reinstall the negative battery cable. Reinstall the negative battery cable and tighten it.

turning on the ac

Step 4: Test the A/C. Once you’re finished, turn on the A/C to see if it’s working. If not, you should have your A/C system diagnosed by a trained professional.

If you’d rather have someone tack the job for you, the team at YourMechanic offers expert A/C pressure switch replacement.


Next Step

Schedule AC Cycling Switch Replacement

The most popular service booked by readers of this article is AC Cycling Switch Replacement. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent AC Cycling Switch Replacement reviews

Excellent Rating

(8)

Rating Summary
8
0
0
0
0
8
0
0
0
0

Ben

41 years of experience
1410 reviews
Ben
41 years of experience
Audi A6 Quattro V6-3.0L Turbo - AC Pressure Switch - Houston, Texas
Very thorough work to find out the real issue so that you do not just replace some costly component.
Mercury Milan - AC Pressure Switch - Humble, Texas
Outstanding

Scott

36 years of experience
898 reviews
Scott
36 years of experience
Nissan Altima L4-2.5L - AC Pressure Switch - Tempe, Arizona
Scott is very friendly, knowledgeable and always does an amazing job!
Nissan Sentra - Oil Change - Phoenix, Arizona
Scott was great!

Manuel

32 years of experience
580 reviews
Manuel
32 years of experience
Chevrolet K1500 Suburban V8-5.7L - AC Pressure Switch - Anaheim, California
He had the correct equipment especially working on ac units according to federal regulation. He knew what he was doing, got the right part after 2 wrong attempts on the prior mechanic and everything is working as it should. I really wish I had him to begin with

Greg

22 years of experience
333 reviews
Greg
22 years of experience
Audi A4 Quattro L4-2.0L Turbo - AC Pressure Switch - Gilbert, Arizona
Awesome job

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How Long Does a Transmission Oil Pressure Switch Last?
The The transmission oil lubricates the different parts in the transmission to ensure they are protected against heat and friction. In addition, the transmission fluid pump creates hydraulic pressure inside of the transmission. The purpose of the transmission oil pressure...
P0533 OBD-II Trouble Code: A/C Refrigerant Pressure Sensor Circuit High Input
P0533 means the A/C refrigerant pressure is too high to safely function often due to inoperative cooling fans or too little or too much refrigerant.
How to Replace an AC Condenser
The AC condenser malfunctions if the air conditioning system has clogged passages or leaks, or if the condenser electric fans stop working.

Related questions

Air conditioning compressor stopped working
If the compressor was recently replaced and has stopped working then most of the time it is because a fitting was left loose and all of the refrigerant came out or there is a loose electrical connection. It is also...
What does it mean if my reverse lights are not working?
Reverse lights are an important safety feature that alert pedestrians, and other drivers, that your vehicle is about to move or is moving. If there is power at the reverse light bulb terminals when the vehicle ignition switch is on,...
loud buzzing on driver side while in motion. no dash lights on?
Hello, thank you for writing in. There are several moving parts that can cause a vibration in regards to the air conditioning system. You or a technician will have to go through the components one by one until the vibration...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com