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Coolan overflow
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Radox   
Fri Oct 30 2020, 07:18am
Joined: Aug 27 2019
Member No: #4044
Location: Bad Bergzabern
 I never seem to get rid of the new and new problems thet keep coming with my C6.

Two days ago, while driving, I noticed a strong coolant smell in the car. After I parked it and opened the bonnet, there was a large stain of coolant on the expansion tank, which had obviously overflown through the cap. Two days later I decided to top it up and there was about A LITER missing!

This has actually happened several times to me in the past 2 years, but it has never overflown that much. Basically, these overflows happen every 3-4 months on the average. Is this normal? What causes the coolant to overflow at times?

I have had no leaks since refilling (for now).
Fraunie   
Fri Oct 30 2020, 07:57am
Joined: Dec 09 2018
Member No: #3763
Location: Stockdorf
 Could be the cap with its built-in valve which has a tendency not to work properly.
Cheap replacement btw...
Radox   
Fri Oct 30 2020, 08:01am
Joined: Aug 27 2019
Member No: #4044
Location: Bad Bergzabern
 I have changed the cap less than a year ago. I hope it's not again broken...

What puzzles me is why is this happening only occasionally and not every day? I drive the same route every day.
Fraunie   
Fri Oct 30 2020, 01:04pm
Joined: Dec 09 2018
Member No: #3763
Location: Stockdorf
 It might be possible that you have got larger bubbles of air in your system.

Did you do the whole procedure of bleeding the system?

Or have you used a modern venting system for coolants?
Tjensen   
Fri Oct 30 2020, 01:42pm
Joined: Jul 17 2012
Member No: #954
Location: Bergen
 I had this problem many years ago with a Renault R4. Head gasket leaked high pressure gas into coolant system and pushed coolant out of the system when the engine was hot. It varied with engine temperature. Hope your problem is the cheap cap (NB: three different types of caps with small differences, probably not important)
kitch   
Tue Dec 01 2020, 01:39pm
Joined: Sep 19 2020
Member No: #4485
Location: Hampshire
Radox wrote ...

I have changed the cap less than a year ago. I hope it's not again broken...


I would hope it is!
 

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