Leaking coolant through expansion tank cap-Caterham with Vauxhall C16nz2 engine

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MartinL2
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I am pretty sure I have only had this problem since replacing the coolant. The caterham is fitted with a heater and I have disconnected a heater pipe to vent it from there.

Martin
MartinL2
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Obviously also vented it from the top of the radiator as well.

Martin
MartinL2
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Obviously also vented it from the top of the radiator as well.

Martin
SM25T
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It sounds like an airlock preventing coolant from circulating.

ECR
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Airlock looks probable but for peace of mind i'd replace the cap (theyre not expensive)

O/E Rover part number:  PCD100160

Halfords HRC606

0.8 to 1.2bar opening pressure.

I have the 2ltr engine which always sprayed coolant when used hard on track. Fitting a swirlpot into the system cured that..

No sign  that I can seeof oil in the coolant so a head gasket problem looks unlikely

Geoff Brown
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I don't want to be the bearer of bad tidings but when a K Series (I know it is not that engine) continually blows out vast amounts of coolant from the header tank even after the pressure cap has been changed & the system thoroughly bled then the head gasket has failed......

MartinL2
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Thank you for all your responses, I have purchased a new cap today, going to try flushing and refilling and fit new cap and see how it goes. Can anyone advise the best way to refill avoiding any airlocks? The car is fitted with a heater. Martin

Martin
Jonathan Kay
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There's been much less posted here about bleeding Vauxhalls than Ks. One thread from 2015.

Usual principles... Air comes out of the highest points and there may be more than one. Heater circuit open. Thermostat has to be hot enough to open. 

Jonathan

MartinL2
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Thank you for all your responses, engine flushed, replacement expansion tank cap fitted, refilled, and all air pockets vented, no water blowing out the top on test drive. Just need to get a bit of antifreeze in their now. Martin 

Martin
anthonym
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This sounds familiar, tried all sorts on my K, replaced what appeared to be a perfectly good (20 years old) cap and the problem stopped immediately. Anthony