Skip the auto shop - Our mechanics make house calls

How to Replace an AC Pressure Switch

ac compressor

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

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

More related articles

How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: How Does Climate Control Differ From Air Conditioning?

Climate control and air conditioning are terms that are very often used interchangeably. These two systems are related, but they are not the same. The climate control system is used to achieve and maintain a temperature inside a vehicle that...

Q: How do I use the auto up/down windows?

If your vehicle is equipped with the auto up/down windows, then you can roll the window all the way down or all the way up with only a quick press of a button. Press the Power Window switch down to...

Q: What tips should be followed for operating the Heating and Air Conditioning?

In order to get the most out of your car’s Heating and Air Conditioning system, you’ll need to use it correctly. Here are the tips recommended by Ford: Use the front defrost or defrost and lower vents setting to...