Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing AC Pressure Switch

Ac pressure switch

Bad or Failing AC Pressure Switch Inspection

by a top-rated mechanic at your home or office

The AC pressure switch is a safety switch that is mounted on both the high and low sides of the AC system. It monitors the pressure of the refrigerant on its respective side of the system. There is a high side pressure switch, and low side pressure switch, and they both serve to monitor the system for pressure faults that can possibly damage the compressor.

When the pressure is too low, the compressor risks damage due to running with low oil; and when it is too high, the compressor is at risk of overheating and becoming damaged. Depending on which side of the system the sensor is mounted in, when the pressure rises too high or drops too low, the switch will turn off the compressor to prevent possible damage from occurring. As the pressure switches serve to protect the compressor and rest of the system from damage, they play an important role for the proper function and service life of an AC system, so they should be replaced if they are causing problems. When they begin to fail they will usually display a few symptoms that will alert the driver of a potential problem.

HAVE SYMPTOMS OF CAR TROUBLE?
Get an $80 diagnostic
by a top-rated mechanic at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

1. AC system cutting on and off rapidly

Repeatedly cycling on and off is part of the normal operation of an AC system. There are periods where the AC is turned off, such as when the proper temperature has been reached, and the pressure is adequate. However, if the system is cycling on and off very frequently or more rapidly than normal, then that could be a sign that the cycling switch is not functioning properly.

2. Unable to get cabin of the car cool

If either of the AC pressure switches fails, then the system will have a difficult time maintaining the pressure required to function properly. If the pressure is not right, then the AC system will not be able to produce the cold air required to adequately cool the cabin. You may notice that the cabin takes a longer time than usual to reach the correct temperature, or may not even be able to reach the correct temperature at all.

HAVE SYMPTOMS OF CAR TROUBLE?
Get your car fixed at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

3. Compressor not coming on

As the switches control the on/off function of the AC compressor, a failure in the switch can prevent the AC compressor from functioning at all. The compressor is what pumps refrigerant through the entire system. If it is not functioning, then the system can not operate, and will be unable to produce cold air.

Because the AC pressure switches play such a vital role in ensuring the proper operation and service life of the AC system, any problems encountered with them should be addressed immediately to ensure the integrity of the system. If you suspect that one of your AC switches is bad or failing, have it diagnosed by a professional technician, such as one from YourMechanic. If necessary, they will be able to replace your AC pressure switch so that you can ensure the system remains functioning correctly.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
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

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...


Related questions

Q: I noticed a smell through the heating system

Hello. It may be possible that you are leaking coolant somewhere. Most likely, the leak is coming from the intake or somewhere else near the top of the engine. Since the year of your truck is 2015, it is...

Q: Dash lights won't work.

Hi there. Check for a loose ground wire within the dash. The radio wires could have been tied into the dash lights for lighting and not on its own circuit making the connection unstable. Check the wiring on the radio...

Q: How do you adjust the vents?

Adjusting the air vents in your car lets you fix the flow of hot, cold or fresh air where you want it most. It’s also very simple. Here’s how: Front Right and Left: Move the vent slide left or...