Posted by Goose on March 29, 2018 at 07:35:31 from (166.182.80.126):
I've mentioned this before on this forum.
Here's the scene. 2007 Chrysler T&C minivan. A month or so ago, it set a code P0073 for a failed ambient air temperature sensor. The sensor was replaced with a new one from NAPA. Several days later, it set the code again. I couldn't find anything else obvious, so I erased the code. It reset in a day or two. Besides the outside air temp display, the heater and A/C are also affected because they interact with the sensor.
I replaced the NAPA sensor with a Chrysler OEM sensor. Same result. Erase the code and it resets in about a day. I now have the vehicle at a local independent dealer who was a Chrysler dealer before they lost their franchise in the shakeup a few years ago. Their tech has gone through the system with a lot more sophisticated diagnostic equipment than I have and is drawing a blank. He even patched in an entire different heater/A/C control head with no change. He admits he's stumped. All of his diagnostics show there is no problem, yet the problem exists.
Do any of ya'll have any ideas? Thinking back to the days when I worked on avionics systems in jet fighter planes, it was known that of all of the really tough,unheard of problems, probably more were fixed over a beer in the Staff NCO Club than out on the flight line. You'd mention it to a couple of your buddies from a different unit over a beer, and pretty soon someone would think of something that happened once in a different squadron, and the conversation would take off from there.
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