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Model specific boards => Golf mk2 => Topic started by: edpryce on 13 March 2009, 17:08

Title: air bubble?
Post by: edpryce on 13 March 2009, 17:08

i realise there is a lot on heating in the search, but nothing came to light.

if i am getting hot air from the heater, but it is coming and going, am i right in thinking this is likely to be an air block in the system?

If so, what is responsible for air in the system?

head gasket was compression tested and is fine.

84 gti.

thanks

Title: Re: air bubble?
Post by: rubjonny on 13 March 2009, 17:10

if the coolant level drops this will cause nthe heat to cut out, but it might be down to your bypass valves.  i wrote up a coolant faq in the garage section, the method in there has never failed me when bleeding the system :)

Title: Re: air bubble?
Post by: edpryce on 13 March 2009, 17:19

yup just reading that. so if i bleed it it should be good to go?

and if it does it again, is it about replacing that by pass valve with copper pipe?

ed

Title: Re: air bubble?
Post by: Gambit on 13 March 2009, 21:53

if you have the bypass valves either replace them or cut them out they will be the cause of your intermittant heat

if you cut them out you run the risk of the matrix spliting at some point if it hasnt ever been replaced. and thats a bigger cnut of a job than replacing the bypass valves.

Title: Re: air bubble?
Post by: edpryce on 13 March 2009, 22:35

there is no history of it being replaced. i heard changing the matrix is a massive ball ache how do people without the heater by pass valve stop the matrix from blowing up?

Title: Re: air bubble?
Post by: Gambit on 13 March 2009, 22:43

they dont, trust me :) once it blows though you get a mk3 item then your safe

or just replace the bypass valves for 27 quid approx!!

Title: Re: air bubble?
Post by: Ben Lessani on 14 March 2009, 10:58

A new matrix is only about £30 - don't bother buying the poopy valves.

Its a 3 hour job to change, probably could do it quicker, its not that hard.

Title: Re: air bubble?
Post by: edpryce on 14 March 2009, 12:17

thanks chaps.

Am I right in thinking that driving it how it is wont do any damage other than it being an inconvienance with de-misting?

Title: Re: air bubble?
Post by: Ben Lessani on 14 March 2009, 12:18

That and cold toes :wink:

Title: Re: air bubble?
Post by: edpryce on 14 March 2009, 12:25

cheers.

ah least it happened after all the snow and ice (fingers crossed)

Title: Re: air bubble?
Post by: rubjonny on 16 March 2009, 08:08

I've heard of them blowing even with the valves...