Skip the auto shop - Our mechanics make house calls

How to Replace an AC Evaporator Sensor

evaporator sensor

An air conditioning pressure evaporator sensor changes its internal resistance in relation to evaporator temperature. This information is used by the electronic control unit (ECU) for compressor control.

By cycling the compressor clutch on and off in response to evaporator temperature, the ECU prevents the evaporator from freezing up. This keeps the A/C system functioning properly and prevents damage.

Part 1 of 3: Locate the evaporator sensor

In order to safely and efficiently replace your evaporator sensor you need a couple of basic tools:

locating the evaporator sensor

Step 1: Locate the evaporator sensor. The evaporator sensor will either be mounted to the evaporator or the evaporator case.

The exact location of the evaporator varies from vehicle to vehicle, but it is generally located inside or underneath the dash. Consult the repair guide for your vehicle to determine the exact location.

Part 2 of 3: Remove the evaporator sensor

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 evap sensor connector

Step 2: Remove the sensor electrical connector.

unscrewing the switch

Step 3: Remove the sensor. Apply downward pressure on the sensor to release the tab for removal. You may also need to turn the sensor counterclockwise.

  • Note: Some evaporator temperature sensors require the evaporator core be removed for replacement.

Part 3 of 3: Install the evaporator temperature sensor

installing the new evaporator temp sensor

Step 1: Install the new evaporator temperature sensor. Insert the new evaporator temperature sensor by pushing down on it and turning it clockwise if needed.

reinstalling the electrical connector

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 everything is complete, 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 tackle the job for you, the team at YourMechanic offers expert evaporator temperature sensor 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

The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...


Related questions

Q: Car stalling while idling and driving

While there are no official technical bulletins put out by Nissan there is quite a bit of documented cases where replacement of the crankshaft and camshaft sensors have corrected these stalling issues while idling and driving. Before throwing sensors at...

Q: A/c not working

There is a technical service bulletin that may pertain to your Toyota Camry T-SB-0205-12. This calls for replacement of the car's cooling fans and a reprogram of the engine computer. The fans may not come on sometimes and make the...

Q: What all needs replaced when you change a camshaft position sensor? 2003 Hyundai Sonata

Hello - only the camshaft position sensor needs replacing. Sent to CS camshaft position sensor replacement