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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old July 12th, 2011, 14:06   #1
tron2003
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Default Ambient Temp Sensor Testing?

Is there a way to test this sensor to see if it has failed?
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Old July 12th, 2011, 14:22   #2
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If you are talking about the IAT, you can use VCDS. Look at measuring group 007 in the engine after it has cooled off, preferably at night.
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Old July 12th, 2011, 14:27   #3
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A new CTS cured my erratic temperature gauge, even though the engine performed normally.
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Old July 12th, 2011, 14:41   #4
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If you are talking about the one for the AC system, under the plenum, I have seen two types (I think). One type is truly a switch - it opens when below 35 F or so.

The other type is a thermistor, you can check the resistance with a multimeter. Mine read 1.1 kohm at 75 F or so.

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Old July 12th, 2011, 14:41   #5
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I was talking about the outside temp sensor for AC purposes, it's located behind the cowel on the left side of the car..... follow up the crack between the drivers door and the left front fender. It will be located in behind the top of the fender just below the left bottom corner of the windshield.... remove the black plastic under the hood to access it.
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Old August 3rd, 2011, 20:54   #6
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Here's the one I have : http://www.worldimpex.com/parts/genuine-part-ac-temp-switch-2-pin_147288.html


I'm coming up with .7 ohms at roughly 75 degrees (F). I would also guess I'm not suppose to hear a sounds like a BB rattling in the metal end either.

Thoughts?
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Old August 4th, 2011, 03:17   #7
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I think it is supposed to read low resistance when above about 35 F.

Not sure about the sound; I have no experience with that type.

What has you looking at it? AC issues?
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Old August 4th, 2011, 03:56   #8
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Yes, A/C issues plus I just had a wiper motor go out so I figured I would double check that as long as I was right there.
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Old August 4th, 2011, 04:22   #9
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Don't forget to clean the grounds by the ECU while you are there, as well.
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Old August 4th, 2011, 06:23   #10
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I don't mean to hi-jack your thread, but would either of those sensors cause my A/C to not work unless it is hot outside? I've had this issue for several days and it's becoming annoying.

The A/C won't work in the mornings (around 70 degrees) and I have difficulty getting the windshield to unfog on the way to work.

On the way home from work (90+ degrees), the A/C works fine.
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Old August 4th, 2011, 06:53   #11
DanG144
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The ambient temperature sensor is an interlock for AC system operation, so yes, it is a potential cause of your problem.
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Old August 4th, 2011, 09:50   #12
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Quote:
Originally Posted by DanG144 View Post
The ambient temperature sensor is an interlock for AC system operation, so yes, it is a potential cause of your problem.
Where is that located and what does it look like?
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Old August 4th, 2011, 09:58   #13
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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.
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Old August 4th, 2011, 12:49   #14
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Quote:
Originally Posted by DanG144 View Post
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.
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.
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Old August 4th, 2011, 13:36   #15
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You are correct. Access from outside. Pull the wiper arms. Pull the cabin filter cover. Pull the black plastic trim grill (carefully, they get brittle).

It is easily found after that.

Rodents love to chew the wires off of them.
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