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Heater MK1 golf

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Hi Guys Ive been for a really good run today…at one stage of the journey i was very hot but turning the heater to cold didnt really do much  is this the design as when its turned to hot boy its hot.

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Its not 'air blend' system like newer cars which direct air over the heater or not giving instant hot or cold. It takes a while for the ambient air from outside to cool the hot water in the heater matrix.

The other problem may be that the cable is not cutting off the supply at the valve, check when you move the lever the valve under the bonnet is moving correctly.  

1983 Mars Red 1.8 Golf GTI
1987 Alpine White 1.8 Clipper Cabriolet

The trouble with doing nothing is that you never know when you are finished.

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Early-1800 said



The other problem may be that the cable is not cutting off the supply at the valve, check when you move the lever the valve under the bonnet is moving correctly.  

Yep, I would go with that. or your valve is knackered… just don't go back with oem, use a non-vacuum valve off a 944 Porsche.


What do Divorces, Great Coffee, and Car Electrics all have in common?

They all start with GOOD Grounds.

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Thanks guys.

Where about is this under the bonnet ?

Not sure what i'm looking for

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heatervalve.png

1983 Mars Red 1.8 Golf GTI
1987 Alpine White 1.8 Clipper Cabriolet

The trouble with doing nothing is that you never know when you are finished.

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thanks guys i can confirm its operating as it should …well  thats on the outside, do these fail internally ?

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They usually leak, but suppose they could still allow hot water to pass if fkd internally.

Turn off before starting engine, feel both hoses that run into the bulk head. Run car, do the hoses get warmer/hotter/hot?

1983 Mars Red 1.8 Golf GTI
1987 Alpine White 1.8 Clipper Cabriolet

The trouble with doing nothing is that you never know when you are finished.

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The answer is yes they can fail internally i have had the Screw strip and the mech stayed closed and didn't heat the car so I replaced it….. about 6 months later it exploded apart as I was driving down the road…No indication it was leaking at all prior.

The new ones can explode off the car.

Here is what they look like assembled.
Screen Shot 2020-06-18 at 7.33.17 AM.png

Here is the Guts of the thing after the ultrasonic weld gave up on a drive,… I rapidly lost coolant wonder why?

Screen Shot 2020-06-18 at 7.33.01 AM.png

Here is one that was only hours old, and leaking like a sieve.

Screen Shot 2020-06-18 at 7.36.48 AM.png


Lay a good bead of JB=Weld Full strength around and in to the seam using a Syringe, then allow to fully cure for a day, you have to mix it 50-50 be exact, I use a scale and disposable plastic lids from coffee tins.

Screen Shot 2020-06-18 at 7.37.23 AM.png

Which is why I am now recommending using the Porsche valve as I haven't heard of them blowing apart, or having weak heat sealing, as I had 2 brand new ones from different sources leak in the same area…

OEM on my 81 never failed, and never leaked in the 20 years I drove my bunny.

Screen Shot 2020-06-18 at 7.41.46 AM.png

Porsche 944 valve.
Screen Shot 2020-06-18 at 7.43.15 AM.png

Easier to adjust your heat/cooling, and is easier on the mechanism….(heater control sliders).


What do Divorces, Great Coffee, and Car Electrics all have in common?

They all start with GOOD Grounds.

Where are my DIY Links?
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