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View Full Version : Boiling coolant, desk temp 90def, no radiator fan switched on



Silv3r
04-09-2018, 07:58 AM
My coolant got BOILED with visible small smoke, reached the cap (full reservoir) and leaked away from occurred crack in the reservoir...

The temp. On desk 90 deg, the fan did not turn on, outside temp. around 15deg and it happened when I stopped... I did not even drive fast [emoji20]

What could happen?

My Audi drives me crazy last days ...

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Silv3r
04-10-2018, 11:17 AM
Radiator fans are OK

Where to find the coolant temp sensor and how to test it?

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bwhite2332
04-10-2018, 07:12 PM
Coolant temp sensor is at the bottom of the expansion tank. If it comes out, so will all of your coolant


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Silv3r
04-27-2018, 03:12 AM
I found the issue... The cap (!) https://uploads.tapatalk-cdn.com/20180427/c60dd3285fb3acd27bc715f8a11b9adb.jpghttps://uploads.tapatalk-cdn.com/20180427/bcb698a3892dd6c705a8bb6e0edabe61.jpghttps://uploads.tapatalk-cdn.com/20180427/078ee252074a75516c733182c344323a.jpg

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JamesRS5
04-27-2018, 03:31 AM
That will do it, itís a pressurised system so with a failed cap the water will be allowed to boil where it would normally boil at a higher temperature.