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I drive 40 miles to work every day, and it seems to be off 40 to 50 degrees, but it's never close. Three degrees would be great right now.I drive 40 miles to work every day, and it seems to be off 40 to 50 degrees, but it's never close. Three degrees would be great right now.
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It is in front of the ac/radiator core,2 wires going to it, but they seldom fail, in most cases it is the little circuit that takes the signal and translates it to a number, let me know how much it is off, (+) or (-) 3 F degrees is ok. also be aware that the system does not update as soon as u start the car, it is averaged, u must drive a certain number of miles before it will read current ambient temp.
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the outside temp could be the outside sensor, if you don't worry about knowing the outside temp its no problem, the oil leak is something to look into and repair
I would check for a bad coolant temperature sensor, of a bad ambient air temp. sensor. You can check these with a good voltmeter, but a scanner would make things much easier. With the scanner, you can se what the computer thinks these sensors are telling it. If it's 20 outside and one of the sensors reads something like -10, there's the problem, but a five degree variation is not enough to make a difference.
It sounds a lot like the control module isn't seeing the ambient temp signal. I don't think that the outside temperature sender would be the problem though...There should be a cabin temp sender that tells the a/c when to come on, otherwise if it relied on outside temp, it would never turn off. Till you find the real problem, you could temporarily add a toggle and fuse to the compressor itself, perhaps through the high and low pressure cut--off switches, to operate the a/c manually. Without actually being there to do hands-on testing, that's the best I can do for you. I really wish that they would standardize some of this stuff...I have lots of general mechanical experience as well as A/c, but not specific to Audi. Good luck with it and hope someone with experience on your system can help you out with that!
sounds as thought the location of the temp sensor is not very good. If you had a way to trace the sensor, you could find out. If its too cold, someone has placed it in the wind, or in front of the car. If its reading too hot, its sitting too clos the the radiator/engine/or exhaust. If you have had any body work done to the car, or major work in general, someone probably moved it. Or maybe the person before you had work done to it. (if its used). And I guess the sensor could be broken, but in that case, they usually read one temp, or read error.
when its at -40 usually its because the ambient temp sensor is not sending the proper signal to the controller.. it may just be disconnected.. the sensor it behind the grille.. it has a 2 wire connector to it ... itf its connected it may havea broken wire from body damage in an accident... its rare that the sensor fails..
As of this morning, the outside air temperature was indicating correctly. I suspect that washing the car using high pressure spray near the grill somehow caused the sensor to malfunction until it dried out.
I drive 40 miles to work every day, and it seems to be off 40 to 50 degrees, but it's never close. Three degrees would be great right now.
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