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

If you did the thermoswitch mod and the fan doesn't start after the engine comes up to temp...

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Old Apr 22, 2006 | 10:31 PM
  #1  
odoboyusa's Avatar
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Default If you did the thermoswitch mod and the fan doesn't start after the engine comes up to temp...

I have done the thermoswitch mod about a month ago and since the thermoswitch is an 87F type, i figured the fans and electric water pump should kick on evry time i turn off the engine (after it came to normal temp of course...)
To my surprise, it only worked during hotter days, during the cooler days it would not come on. At the same time i noticed that my engine temp gauge is a little bit under the half (just about 1/4 of division) and i did a log of the engine temp. This proved what i suspected... the thermostat is not doing its job anymore and my engine is runing too cold...the temp in a cooler day went under 87F.
So, if any of you AW members are having issues with the thermoswitch, you might want to check the engine temp.
The tricky part is that the temp gauge "middle" covers about 10 degrees (it's dampened), so when it starts going under, you're actually at least 5 degrees below the nominal temp. Now, replacing the thermostat... that's a whole new horror story.
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Old Apr 23, 2006 | 06:00 PM
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yrk2.7t@curbside's Avatar
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Hmm interesting, I have one in the garage waiting for an install.
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