heater

[free]

rite im not happy  now fort it might of been the themostat, but no.............
if u just have the vents open 75% of the time warm air will come out,
bit as soon a a few sec after u put the fan on it blows cold..... ne ideas? it's to cold now to be with out it, n my window keeps steaming up its a nightmare!!!!!
HELP 

[Blue MK2]

airlocks/blocks.

tried removing those valves?

[free]

NO I BLED IT N STUCK HOSE PIPE DOWN THE RAD, MATRIX N LOADS MORE PLACES, WHICH DO U MEAN MATE?

[billydude]

you need these

?30 from dealers

I've just had the same problem 

[free]

thanks billy ill try that

[billydude]

I douted theyed make a difference 
but if you bypass the metal one you'll have constant heat
rather than a bit of heat till the engine warms up 

the dude at vw described my heater when I put the valve on the counter Lol

[jajones]

hi I am hoping someone can help me here before I go mad. I have a heater which works for about 5 mins then goes cold, very cold. I have removed and cleaned the valves, one metal and one plastic. There is hot hoses and I assume water both sides of the metal one and I'd say the water is slightly less hot both sides of the black plastic one. When I removed them there was water coming out the hoses.

before I go and spend ?30 on a new vavle kit can any of the knowledgable owners confirm if this coudl be what is wrong with my car. Some time back I was stuck in trafffic and the heater also stopped working then, which made me think it might be the water pump ! much appreciate any advice.

rgds,

 Jules

[action al]

Sorry to tell you, but I reckon it's your matrix!

This is a pig of a job to change and takes about 5-6 hours
The valves are doing there job and directing water back around the engine when the pressure builds up in the matrix.

Bypassing the valves will only cause the matrix to blow, causing anything from steamed up windscreen and a funny smell of antifreeze, to scalded feet. Nasty!

Take my advice, don't bother bypassing the valves! only replace them if they're not working. The valves are no longer available apparently, so you'll have to get some from the breakers!

Take the plunge and replace the matrix, ?38 from GSF (Genuine Valeo) instructions are on the clubgti forum, and make sure you have a whole weekend free, just in case!

[jajones]

Al, thanks for your reply, I may have made an error previously, just warmed car up and the thermostat works ok, also the silver valve is hot both sides, but the black one is cold both sides ? no flow, but..........I removed it and may have put in back to front, I have the black one with the flow coming out the heater back to the engine ? so do you think now with this is could be the valves ?...........the heater replacement does not sound good. thanks in advance

[action al]

Al, thanks for your reply, I may have made an error previously, just warmed car up and the thermostat works ok, also the silver valve is hot both sides, but the black one is cold both sides ? no flow, but..........I removed it and may have put in back to front, I have the black one with the flow coming out the heater back to the engine ? so do you think now with this is could be the valves ?...........the heater replacement does not sound good. thanks in advance

That's right, the black valve should be flowing from the heater back to the engine, this is the return pipe from the heater. (the valves have arrows on to indicate flow direction)

Try letting the engine cool down a little after a drive, (prob about half an hour, till the pipes feel cooler to the touch) then remove the pipes on the heater side of the valves, the water will prob be cold. then try removing the pipes on the engine side, these should both be warm water.

If this is the case then the valves are working and it's just your matrix that is at fault.

If the water in the return pipe after the bypass valve is cold, then you need to replace the valve aswell.
Make sure you get the valves the right way round before testing.

When the valves are out of the car try running the metal one under a hot tap with the flow going through the valve, (in direction arrowed on valve) if it comes out the other side of that valve then theres nothing wrong with it. If the water flows through to the black valve and exits that one then your valve is stuck and you need another one.

Test these things to make sure your valve is ok.
But i'm sorry to say it sounds like it's def your matrix!