12 Valve intake temp sensor

dodge359

dodge359

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Jun 20, 2007
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What does the intake air sensor on a 12ver do (Other tan sense intake temp). Can it be tapped into and made to work a gauge also?
 
It tells the intake heaters when to turn on & off. Don't know about a gauge, it is probably a thermister type sensor. Don't know if a guy would be able to find a gauge that would match the resistance or voltage range.
 
So its probably an on/off switch rather than one that reads a wider spectrum?

I wonder if a trans gauge would work or if it has to have fluid contact to be accurate or to keep up with the rapid changes.
 
No, it has a variable range to it, depending on temp. But say it has a 13 ohm to 265 ohm range, is there a gauge out there that has a matching range?
 
kalder,
I see you are an ex-Chrysler Tech (I have a keen eye for the obvious). At what temp do the warmers come on at?
 
They come on ~66 degrees or lower. They are controlled by the PCM. The pre-heat cycle can last as long as 30 seconds- thats at 0 degrees. I think that must be a really vaugue number- I had mine come on for around 30 seconds on some 8-12 degree mornings.
 
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