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I don't what the cause is, but mine has been doing the same thing for about a week now. Today its been reading 61 degs. all day, even though its about 96 out :confused: Problem with the sensor?
Happened to me once, but mine was user error :rolleyes: It read 60 all day and it was about 90 out, then I realized it was showing the interior climate control temp, my button wasn't making contact to switch between outside/inside temps. I had to clean the button, it was kinda sticky like soda or something splashed in there.
The little black thing in the middle of the dash also is a temp sensor. It works in conjunction with the outside sensor....Somehow?
I was pretty sure the bump in the dash was the lens for an infrared pyroelectric (temperature) sensor. My outside temp seems to lie a little based on the termal energy stored in the windsheild glass. If the car has been smoldering in the sun it reads high, if it's just been washed it reads low.
The sensor in the middle of the dash is the sun load sensor. The interior temp sensor is over in the passenger side vent. The sensor for outside air temp is located in the center of the air dam area, front bumper, looks kinda like a deer whistle and I believe it is around 12 to $15 US.
I've noticed mine "sticking" a couple times too. It'll show one temp that's obviously wrong for a while after I start the car, then all of a sudden it'll change a lot to a temp that seems about right. I was thinking it could be the sensor in the front, or I've heard that the contacts to the C68 programmer (the climate control panel in the dash) get dirty and need to be cleaned. Maybe one of those contacts is dirty, providing a little too much resistance???
The C68 outside temp has a delay feature built into the programming. Am away from my manual and cannot recall the speed/time feature. Supposedly if you park on a black asphalt parking lot, turn on the air, the car would see a really high temp. The system waits for a "rolling" air sample and uses this for the calculations in auto mode. Something like that. The sensor's do occaisonally clog up with debris and can give a false reading. Physical inspection and ohm check would tell.
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