Heater blowing hot air

[Paul V]

I had a new heater valve fitted a couple of years back but the fans still always blow hot or even hotter lol. With the current heat it's really bad having hot air coming out the vents. Is there a trick to stop them blowing hot air all the time?

[mongoose]

Yes there is a 'trick'.The valve needs syncronising so that it is fully closed when your heater control know is set to coldest position.Theres lots in the archive already on this,so if you do a search you should find it easily

[Paul V]

At the moment the motor is disconnected and have it marked so I can tell it is fully closed at the moment, but it's still Kicking out a lot of hot air and the pipework to the heaters is getting very hot still. Maybe I should try another new valve?

[mongoose]

Check if the valve is passing by disconnecting the hoses,connected in the engine bay.When you have the inlet and outlet taken off,get a hosepipe and try to send water through the matrix,obviously if water comes out the other end then its either not quite fully shut or its faulty

[JoolzB]

I took the valve out of mine a while back and made sure it was closed, it was however easy to blow air through it still so I guess it's either knacked or they're not upto the job. TVR wanted something like 70 quid for a new one which I didn't go for as they look so flimsy and I couldn't see it lasting long. So if you find an alternative can you post it up on here as I'd be interested. I'll get round to looking myself once I get a bit of free time. I know some on here get cold air but I'd imagine that generally most don't, just guessing tho.

[Seasider]

Is it possible to put a manual off/on valve on the inlet pipe before it goes into the bulkhead ??

[Paul V]

I did think about adding a simple on off valve from a mini as looks like a similar size hose, thought with 2 it might actually stop the water flowing lol.

[Paul V]

I've managed to find the original part, or what mine was anyway lol. It was from a MK1 Golf, I bought mine from GSFcarparts.com and was the only £9.50 plus VAT, better than the £70 TVR wanted. You do have to drill and small hole it and chop it cut of the VW mounting but that takes only a few minutes. The old valve you could blow through even when fully closed but the new one seems air tight so hopefully water tight. I made sure it was fully closed but the fan still blow warm air, much better than the very hot air they were blowing before though.

This is the old heater valve



This is the new heater valve as it comes



This is the old and new heater valve after I drilled the hole and cut the end off, the hole in the centre also needs to be enlarged, I used a 4mm drill which did the job fine

Edited by Paul V on Wednesday 26th July 19:57

[crackedfinger]

Are you still able to mount a motor to it?

[Paul V]

Yes once you've drilled it and chopped the edge off then it's exactly the same as the original part so the motor will attach the same as it did before.

[clive f]

preety sure I`ve got the same problem, where can I find this valve exactly?

[tvrjohn]

excellent, how about the part number for purchase from GFS ?

[silv]

Me too! part no please. After replacing the valve does the heater water system need bleeding? If so what is the best way to do it? Thanks

[Paul V]

The GSF part number is 17850, when I replaced mine I used a couple of brake pipe clamps to make sure I didn't lose too much water, then ran the heaters on hot to make sure there was no air lock.

[Seasider]

Cheers Paul

Just ordered £12.90 Inc Jiffy bag post (Don't even know if mine is fd but i certainly don't get ambient air at the moment )

[Paul V]

I took mine for a spin last night and it's not cool air but much better than it was before, now if I can get the air con working I'll be happy

[Ballistic Banana]

Seasider said:

Cheers Paul

Just ordered £12.90 Inc Jiffy bag post (Don't even know if mine is fd but i certainly don't get hot air at the moment )

Hot air and Seasider in the same sentance ;rolleyes:

BB

Paul YHM

[Seasider]

Ballistic Banana said:

Seasider said:

Cheers Paul

Just ordered £12.90 Inc Jiffy bag post (Don't even know if mine is fd but i certainly don't get hot air at the moment )

Hot air and Seasider in the same sentance ;rolleyes:

BB

Paul YHM

Harsh













But fair

[virgil]

Cheers Paul, good work.

Just ordered mine...though was more expensive than Seasider's....must find out where he goes for discount training

Will fit and see what difference it makes...mine certainly does not stop hot water coming through - may slow it but stop? NO.

Anyone know what the dash switches are from for the up/down control and outside air/recirculate? Mine just spin round without stopping

Virgil.

[Paul V]

virgil said:

Cheers Paul, good work.

Just ordered mine...though was more expensive than Seasider's....must find out where he goes for discount training

Will fit and see what difference it makes...mine certainly does not stop hot water coming through - may slow it but stop? NO.

Anyone know what the dash switches are from for the up/down control and outside air/recirculate? Mine just spin round without stopping

Virgil.

I think mine was about £16 inc post and packing so could also do with Seasider's training too. My up and down control also spins round without stopping so if you find the part number let me know