Ambient Tepm Sensor

[sbtadtt]

my outside temp reads fine when ia driving but when i stop it reads hotter any idea why? i replaced the ambient sensor that didnt help?

[8.1HD/ALLISON]

How much hotter? If it sits a while the heat comming from the radiator can affect it.

[sbtadtt]

if its 75 outside it will get over 100 within 2 min

[8.1HD/ALLISON]

Wow, I have not heard of one doing that. I'm not sure where to go with that one.

[sbtadtt]

ya i didnt know if this was common in an 07 sierra?

[donjames911]

Where is the sensor located, and is it insulated from engine heat? The engine block will heat up to 250 degrees+ with the ignition off due to to the loss of the engine-driven cooling fan. This is a natural process, and with some cars, an aux fan will continue to run after the ignition is shut off. Sounds like this is a non-problem...

[sbtadtt]

the sensor is located in front of the radiator and not to sure if its insulated from engine heat?

[greentourismo]

mine does the same on my 07. Its a combination of engine heat and bad sensor placement.

[quetranpa]

yes your sensor is perfectly fine, I had a '03 silverado and it used to do the same thing when standing with the engine running I remember that it was like 98 deg outside and the temp in the mirror said 128 deg but I knew it was due to the truck not moving and the heat from the engine compartment was causing it to read that much hotter