tron2003
Well-known member
Is there a way to test this sensor to see if it has failed?
Where is that located and what does it look like?The ambient temperature sensor is an interlock for AC system operation, so yes, it is a potential cause of your problem.
Before I start tearing things apart, is it accessed from outside or under the dash? From what you are saying, I'm envisioning it is on the opposite side of where the cabin air filter is located?It is a small cylinder, about half as long a tube of chapstick, located in the windshield plenum, under that plastic grill, on the car left side. Two wires run to it.
What did you find out? What were you getting for an ohm reading?Before I start tearing things apart, is it accessed from outside or under the dash? From what you are saying, I'm envisioning it is on the opposite side of where the cabin air filter is located?
Sorry for all of the newbie questions.
Hmmm, really makes me wonder as I was getting .7. I was in the 200 ohm setting. When I bumped it up to the 2K setting I obviously was getting 0.0.I got 1.1 kilo ohm on my 2005 Jetta.
I've been working my butt off the last several days and still haven't had time to tear into it. The problem is still there.....the A/C will work fine for a while, cut off the engine and it may or may not work the next time. It's driving me crazy and it's too damn hot to be driving around without A/C.What did you find out? What were you getting for an ohm reading?
thanks I will try that when I can.The outside air temperature switch only bypasses the AC when the temperature is too cool. Most are switches. I have a thermistor, but the FCM uses the information the same way.
Your problem is with the cooling system or the signal from the ECT (either the ECT is faulty or there is a wire problem).
You'd have to log group 007 with VCDS to see what's happening. To set P0128, the warm-up time has to be very slow (>15 min above a minimum start temperature).