Skip the auto shop - Our mechanics make house calls

How Long Does an AC Thermistor Last?

ac thermistor

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
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 Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...


Related questions

Q: Possible AC leak

Hi. The air conditioning system is in fact a sealed system and any failure due to a low system charge must be the result of a leaking component. Have a trained technician inspect the vehicle's air conditioning system for signs...

Q: How Frequently Should I Have My AC System Recharged?

The refrigerant in an automotive AC system circulates through a sealed system. It is designed to be totally leak-free and usually is. Many vehicles are driven for years and years without needing any refrigerant added to the AC system. ...

Q: A/C has low air blow

Hello. There could be a problem with the operation of the blend doors preventing the air from blowing as strong through the front vents. The vents also have adjustments on them in order to regulate how much air flow comes...