How Long Does an AC Thermistor Last?

Your car’s air conditioning system is very complex, and made up of several essential parts. One of the most important is the AC thermistor. No AC system can operate without it, whether it’s the AC system in your car, or your home climate control system. The thermistor works to monitor the temperature by measuring resistance – as the heat in your car increases, the thermistor’s resistance drops, and that’s what makes your car’s AC system keep you cool.

Of course, you don’t use your AC every day, unless you live in a really warm climate. The life of the thermistor, though, doesn’t depend so much on how often it is called into action as it does other types of wear and tear. It is an electrical component, so it is vulnerable to dust and debris, corrosion, and jostling. The life of the thermistor will depend less on its age than on the conditions in which you drive – rough, dusty roads, for example, can reduce the thermistor’s life. Generally speaking, though, you can expect the AC thermistor to last about three years.

Signs that your AC thermistor may need replacing include:

  • System blows cool, but not cold, air
  • Cold air blows only for a little while
  • AC stops blowing air

Problems with the thermistor can mimic other issues in the AC system, so if you are having difficulty with your car’s AC system, you should have it checked out by a qualified mechanic. A professional mechanic can do a thorough analysis of your air conditioning system, identify the problem or problems, and if necessary, replace your AC thermistor.


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

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 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.
How to Get an EPA License as an Automotive Technician
Automotive technician jobs require an EPA certification to learn how about the environment while repairing automotive air conditioning systems.
How to Replace a Car Air Conditioning (AC) Low Pressure Hose
Car air conditioning (AC) low pressure hoses carry refrigerant back into the compressor to keep providing cold air in a closed loop system.

Related questions

Opinion about older AC systems versus the AC systems in modern cars
Here is the kicker. The old air conditioning systems (https://www.yourmechanic.com/article/how-does-a-car-s-air-conditioning-work) were huge and they wasted a lot of energy. But with that said, they blew as cool as can be and lasted a long time. For example, you can take...
AC question - 2003 Chevrolet Tahoe
You may have a bad temperature blend door actuator for the left side vents. You should also have the complete system checked (https://www.yourmechanic.com/services/ac-is-not-working-inspection) to make sure you are not low on refrigerant (https://www.yourmechanic.com/services/top-off-coolant) since the left side will be warmer...
A/C control messed up.
The system is controlled electronically and consequently the controller is a possibility. But, to condemn the controller, there is a long sequence of diagnostic steps (from the Factory Service Manual) that have to be performed. Typically, in diagnostics of this...

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