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Model specific boards => Golf mk3 => Topic started by: ruffryder on 22 May 2012, 21:05

Title: 1.8cl expansion tank boiling over but not overheating help.
Post by: ruffryder on 22 May 2012, 21:05

Ok the water tank keeps boiling over but car doesn't overheat. I've change the thermostat an it hasent solved it, I bypassed the matrix still same prob, the bottom hose on rad to thermo never gets very warm can any one help don't know what's wrong with it now would it be the rad

Title: Re: 1.8cl expansion tank boiling over but not overheating help.
Post by: thai-wronghorse on 22 May 2012, 21:14

Sounds like you might have an airlock somewhere.

Title: Re: 1.8cl expansion tank boiling over but not overheating help.
Post by: Bellend on 22 May 2012, 22:10

If the gauge is reaching the correct temps, the header tank cap seal could be broken.

This could also be why it's not getting warm as it isn't pressurising properly.

Title: Re: 1.8cl expansion tank boiling over but not overheating help.
Post by: ruffryder on 22 May 2012, 22:15

Yeh the fan kicks in aswell water comes out of a heather hole bit on side of tank or should that not be a hole lol. The heaters only come out cold but temp gauge goes about half way there's no bleed valve on any hoses

Title: Re: 1.8cl expansion tank boiling over but not overheating help.
Post by: Screech16v on 22 May 2012, 22:32

Does sound like a dodgy cap,get a new blue one to start with,if your old cap isnt sealing then the system will not pressurize allowing the water to boil ,fill it back up leave cap off and run it up,massage the pipes sqeezing the air out ,top up as needed then put the cap back on,see how it goes  :smiley:

Title: Re: 1.8cl expansion tank boiling over but not overheating help.
Post by: ruffryder on 23 May 2012, 05:47

Ok cheers tried that with blowers on but still did it i hsve a spare header tank ill try