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

Coolant warning.

Old Apr 15, 2013 | 10:46 AM
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Default Coolant warning.

Have a 1998 2.4 V6 Quattro.

My coolant symbol in the autocheck is on constant and beeping when i start. Level and temperature is ok.
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Old Apr 15, 2013 | 10:58 AM
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Low coolant sensor, built into your coolant reservoir.
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Old Apr 15, 2013 | 11:01 AM
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Is it the sensor on the bottom of the reservoir?
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Old Apr 15, 2013 | 01:14 PM
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Originally Posted by Rune Korneliussen
Is it the sensor on the bottom of the reservoir?
Yes, it's either unplugged, faulty or has a broken wire.
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Old Apr 16, 2013 | 08:29 AM
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Originally Posted by Rune Korneliussen
Have a 1998 2.4 V6 Quattro.

My coolant symbol in the autocheck is on constant and beeping when i start. Level and temperature is ok.
If it's the original coolant reservoir you're doing quite well...they usually crack long before this!

Disconnect the sensor on the bottom of the tank and see if the light goes out. If it doesn't, short the terminals and see if it goes out. If nothing happens, you've got a bad wire somewhere.

If the light goes out on either of the above, just replace the coolant tank or disable the sensor by leaving it disconnected or shorted (whichever shuts off the light) and check your coolant level old school.
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Old Apr 16, 2013 | 08:36 AM
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One of the 2 wires was loose. I soldered it back on all ok
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Old Apr 16, 2013 | 09:39 AM
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Originally Posted by Rune Korneliussen
One of the 2 wires was loose. I soldered it back on all ok
I just love a happy ending
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Old Apr 16, 2013 | 10:52 AM
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2nd. Now he gets to look for dried coolant from a cracked tank...
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Old Apr 16, 2013 | 01:04 PM
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Originally Posted by SloopJohnB@mac.com
2nd. Now he gets to look for dried coolant from a cracked tank...
Yep, just went through that last week. I noticed a pink, crusty line running down the side of the tank. Didn't lose any perceptable amount of pink stuff but bought and installed a brand spankin' new tank. The thought of a blowout up on I-77 in west by God Virginia was not one to contemplate.

$30 off ebay and it's OEM with coolant level sensor.
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