My '08 1500's outside temp. reading is always lying. When it's 94 deg. outside, it says its 73, when it's 85 deg. it says its 76 degrees! WTF? Anyone else experience this? Our Toyota Avalon's temp. is right-on with the weather radio guy..............hmmmmmmm.

 

Sounds like the ambient temp sensor might be bad. Here is a way to test it....
The ambient temperature sensor is a variable resistor mounted to a bracket that is secured with a screw to the left side of the radiator yoke, behind the radiator grille and in front of the engine compartment.

The ambient temperature sensor cannot be adjusted or repaired and, if inoperative or damaged, it must be replaced.




NOTE: Temperature readings do not update immediately. Allow up to 60 seconds after the ignition switch is turned to the On position for readings to meet test specifications.
1. Turn the ignition switch to the Off position. Disconnect the wire harness connector from the ambient temperature sensor.
2. Turn the ignition switch to the On position. The CMTC display should now read - 40° C (- 40° F) or the EVIC display should now read - - ° C (- - ° F). If OK, go to Step #3 . If not OK, repair the shorted sensor return circuit or ambient temperature sensor signal circuit to the ambient temperature sensor as required.
3. Turn the ignition switch to the Off position. Taking care not to damage the wire terminals, connect a jumper wire between the two terminals in the body half of the ambient temperature sensor harness connector.
4. Turn the ignition switch to the On position. The CMTC or EVIC display should now read 60° C (130/140° F). If OK, go to Step #5 . If not OK, repair the open sensor return circuit or ambient temperature sensor signal circuit to the ambient temperature sensor as required.

 

Is it possible to upgrade my 07' ram quadcab SLT Big Horn 5.9 cummins with an evic overhead console and if so what part numbers will work can I use older evics out of jeeps or durango's? Thanks JD