Symptoms of a Bad or Failing Refrigerant Pressure Switch (Sensor)

The refrigerant pressure switch monitors the pressure in the air conditioning system to ensure it is operating properly. If the pressure gets too low, the switch turns off the air conditioning system. This saves the compressor from running without lubrication and sends a signal that there is a error in the AC system. There are a few symptoms you should look for if you suspect a bad or failing refrigerant pressure switch:

1. Air conditioning works intermittently

When you turn the air conditioning on, does it seem to cool the vehicle down then stop working? Or does it not work all of the time, just at random times? This means the switch may not be working correctly or have an intermittent failure. As soon as this happens, contact a professional mechanic to have your refrigerant pressure switch replaced so you can be comfortable in your vehicle.

2. Air conditioning not working properly

The air conditioning in your vehicle may not seem to get cool enough, causing you to be uncomfortable on a hot day. This can be caused by many factors, and one is a failing refrigerant pressure switch sensor. In hot summer months this can be a safety concern if the outside temperature gets too hot. A mechanic can properly diagnose the issue, whether it is the switch or a low charge in the refrigerant.

3. Noise coming from the AC system

If a high pitched sound comes from the air conditioning system when it is on, this is a sign the pressure switch may be going bad. The switch could be rattling against different parts in the engine compartment, so it is important to have this looked at before other parts are damaged.

4. Blowing warm air

If no cool air comes out at all, it could be a switch problem or another issue within the air conditioning system such as low refrigerant. A mechanic will check the pressure in the system to ensure it has the correct reading. If it is too high or too low, the sensor is most likely failing. In addition, they can read any codes the computer puts out to positively diagnose the problem.

If your air conditioner is not working properly, noises are coming from the system, or it is blowing warm air, contact a professional mechanic. The refrigerant pressure sensor switch is an important part of keeping you comfortable on hot summer days so it should be repaired as soon as possible.

YourMechanic makes getting repairs to your refrigerant pressure sensor easy by coming to your home or office to diagnose or fix issues. You can book a service online 24/7. YourMechanic’s qualified technicians are also available for any questions that may arise.


Next Step

Schedule Heating AC Inspection

The most popular service booked by readers of this article is Heating AC Inspection. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. 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 Heating AC Inspection reviews

Excellent Rating

(59)

Rating Summary
53
4
0
1
1
53
4
0
1
1

Ben

40 years of experience
1191 reviews
Ben
40 years of experience
Volkswagen Beetle - Heating AC - Houston, Texas
i am well satisfied with Mr Smith working on my car(s). He replaced the Jaguar fuel pump like an expert, and then he diagnosed the VW bug ac compressor and fixed it on the spot. I would recommend him to anyone with a car issue
Nissan Altima - Heating AC - Houston, Texas
Incredibly nice and took the time to show me the problem, including comparison pictures between my unit and what a new unit should look like.

Peter

42 years of experience
1320 reviews
Peter
42 years of experience
Saab 9-3 - Heating AC - Phoenix, Arizona
He knows what he's doing. Very polite and explained everything. I would no doubt use him again. I highly recommend him.
Mazda Miata - Heating AC - Peoria, Arizona
We are so thrilled to have found Peter as our new mechanic. He is very thorough and knowledgeable. He is also friendly, professional, and extremely honest. He explained to us exactly what services were needed on our vehicle to repair the air conditioner and provided us with an written estimate of the cost. He literally saved us thousands of dollars in repair costs. A local major competitor quoted us a repair cost of a minimum of $1,400 and said that the cost would go up to $2,400 if they discovered an additional part was required. Peter charged us only $202, plus performed the work at our home. The air conditioner in our 2004 Mazda Miata has honestly never worked so great--it always blew out warm air. We just assumed it was how that particular car was manufactured. We would highly recommend Peter to anyone who is in need of an experienced and honest mechanic.

Matthew

11 years of experience
183 reviews
Matthew
11 years of experience
Acura MDX - Heating AC - Indianapolis, Indiana
Matt was courteous and on time. Unfortunately he was not able to repair or alleviate my problem. I would use Matt again.
Ford Explorer Sport Trac - Heating AC - Indianapolis, Indiana
Matthew was very experienceed I feel He found the problem almost right away.

Leo

17 years of experience
53 reviews
Leo
17 years of experience
Jeep Commander - Heating AC Inspection - Greensboro, North Carolina
He did a very good job with the inspection and explain everything to my understanding, nice job Leo 5 stars *****

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 a Car's Heating System Works
The The sun sets, and the air has a chill. You pause to flip your jacket collar up, and you walk briskly to your car door and slide into the driver's seat. Once you start your car, it’s only moments...
How a Car's Heating System Works
The The sun sets, and the air has a chill. You pause to flip your jacket collar up, and you walk briskly to your car door and slide into the driver's seat. Once you start your car, it’s only moments...
How to Buy a Good Quality AC Condenser and Condenser Fan
A A car’s air conditioning system is an orchestra of different parts working together – the compressor, condenser, accumulator or receiver dryer, expansion valve or orifice tube, and the evaporator. Each component has a specific function and if one part...

Related questions

Air conditioner pump making noise and no cold air. No power coming to pump in 2011 Nissan Rogue

Hey there, thank you for asking about your 2011 Nissan Rogue. When the compressor pump starts to make noise, combined with not blowing cool air, there are many possible problems. It is quite possible that the compressor itself has frozen....

What is the problem? No one can tell me

The vehicle idling in park with no A/C does not really require much need for the idle air control valve. Once the vehicle is put in drive, this will put a load on the engine as the A/C will require...

Why Is My AC Blowing Warm Air?

There are quite a few reasons an A/C system will cease to provide you with cold air. Air conditioning systems are one of the more complex systems on a passenger vehicle. Without getting into to all the complexities and science...

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