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

Temperature Gauge Not Stable

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Old 10-24-2007, 06:21 AM
  #11  
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Default Well that's true, I was just trying to be funny. =) My corrado ran really hot, thought it never...

really overheated.. but when it did, it did a great sugar house impression.
Old 10-24-2007, 06:25 AM
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Default Yeah, the spring would kind of prevent that I'd think..

I've had them get 'weak' where they opened too early and stayed open too long, but never had one stick open. The thermostat I just changed in my A6 was like that, the car would take for ever to come up to temp, and would cool off going down long hills in the winter, but it was not 'stuck open'.. In fact, it still had plenty of spring resistance..
Old 10-24-2007, 06:27 AM
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Mine did. Two cars. Both audis.
Old 10-24-2007, 06:35 AM
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Default Dunno about the C5, but I had two stick open on my older Audis...

They'd take awhile to warm up in cool weather and the temps would drop when cruising, then climb back to normal when in traffic.
Old 10-24-2007, 06:50 AM
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Default Re:

Thanks for the replies.

I wouldn't say it consistantly falls whilst driving.

Somedays it appears to work normally. Then it can fall away to zero, be it in traffic or whilst cruising, then slowly comes back up to almost 90 deg.

One thing I'd say that is consistent, is that it always tends to sit below the 90 deg, where it used to always be rock solid at 90.
Old 10-24-2007, 07:00 AM
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But were they stuck open, or just weak?
Old 10-24-2007, 07:01 AM
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Default Well I'd replace the sensor first anyway, since it's easier....

if that doesn't fix it, the problem could be the gauge, or the thermostat, or somewhere in between.
Old 10-24-2007, 07:19 AM
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I caught the humor (honest I'm not that dense - lol). Just seized the opportunity to make the point
Old 10-24-2007, 07:34 AM
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My thermostat stuck wide open, which prompted me to do the TB job at only 60K miles...
Old 10-24-2007, 07:37 AM
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Default My Saab 9000 and Buick Skylark both had stuck open thermostats

The car never warmed up. The needle would never more an mm.


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