A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

Help fix my air conditioning problems!

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Old Jul 29, 2007 | 04:57 PM
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Default Help fix my air conditioning problems!

Hello,

I've had problems with my air conditioning the past two summers. I've had it charged twice and it still has problems. It seems on hot days 90+ degrees it will blow cold air but then my themometer goes almost 1 tick away from H and it starts blowing hot air. If I turn it off it goes almost to the middle and it goes cool again. Sometimes it has nothing to do with the temp gauge and just blows hot air. I went to the shop that did the recharge last month and they said either there is something blocking a pipe or there is an electronics problem. Even though the temp gauge goes close to H I never see any kind of smoke or anything from the car. I'm wondering if the engine temp sensor is not working and so when it gets to H the a/c cuts off. Also my oil sensor is not working as well. Anyone have any ideas? Thanks
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Old Jul 29, 2007 | 05:01 PM
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Default Re: Help fix my air conditioning problems!

I was just looking around and saw this

http://www.worldimpex.com/parts/genuine-part-ac-temp-switch_91091.html

Could it fix my problems?
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Old Jul 29, 2007 | 05:13 PM
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Step 1: Change the coolant temp sensor.
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Old Jul 29, 2007 | 05:34 PM
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Default Re: Step 1: Change the coolant temp sensor.

Is this the coolant temp sensor? http://www.worldimpex.com/parts/genuine-part-ac-temp-switch_91091.html

I have a feeling all of my temp sensors are broken. Is there a guide to changing the oil temp sensor? Is that the same thing as the coolant temp sensor? Thanks
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Old Jul 29, 2007 | 05:39 PM
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Default Nope.

GENUINE PART
A/C TEMP SWITCH
AIR DISTRIBUTION
TEMP SENSOR

That sensor is some AC part. You need the coolant temp sensor.
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Old Jul 29, 2007 | 05:46 PM
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Probably a problem with the radiator fans..
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Old Jul 29, 2007 | 08:41 PM
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Default Re: Probably a problem with the radiator fans..

I found this thread
https://forums.audiworld.com/a6/msgs/290620.phtml

Is there any way I can diagnose if it is one of these fans by my own testing? Thanks
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Old Jul 30, 2007 | 04:39 AM
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^^^^^What he said ^^^^^^^ check and make sure the aux fan is running when the A/C is on -
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