Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. How to Replace an AC Evaporator Sensor

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

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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 Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...

Related questions

Q: my 04 eclipse wont start no spark from plugs or anything i was driving and it just shut off i replaced timing belt crank sensor an

In the event that diagnostic trouble codes have been set by the PCM, downloading those codes will greatly narrow the possibilities that you have to consider. No spark could be due to bad grounds (possibly in the plenum area; see...

Q: AC is leaking R-134A but no dye can be found anywhere

You should check the A/C evaporator drain with a black light and see if it shows dye leaking out of the drain. This would be the evaporator leaking. You had the evaporator replaced 6 years ago when the vehicle was...

Q: RPM's are higher than normal on gear changes

Hello. It may be possible that the computer is programmed to delay shifting when the vehicle is cold, in order to help warm up the vehicle faster. Once the vehicle warms up, however, shifting should return to normal. If the...