Am I right in thinking that the S1 heater control valve is different from the S2? Reason I ask is that I've finally got my heater working, and now I would like to be able to turn it off!
As far as I can see, the S1 heater setup uses a control valve (rubinetto riscaldamento) that accepts 1/2" hoses at the input and output. But I've seen valves on e-bay that appear to have a flange connection on one of the ports. Presumably these are for a later model?
Or maybe there's some other missing part that I need to find?
Thanks,
Peter
Heater control valve
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Shaun Pond
Re: Heater control valve
Hi Peter,
My S1 has the 1/2" inlet/outlet arrangement that you describe. The valve is mounted on the left hand side of the engine bay and controlled by a cable from the red hand wheel (I think it's the red one; I am not around the car at the moment) under the dash.
I remember having to fiddle with the control cable adjustment on mine to turn the heat completely off. The cable wasn't letting the valve fully close when turned "off". Playing with the cable adjustment with the coolant out and the hoses off fixed things.
Regards,
Shaun
My S1 has the 1/2" inlet/outlet arrangement that you describe. The valve is mounted on the left hand side of the engine bay and controlled by a cable from the red hand wheel (I think it's the red one; I am not around the car at the moment) under the dash.
I remember having to fiddle with the control cable adjustment on mine to turn the heat completely off. The cable wasn't letting the valve fully close when turned "off". Playing with the cable adjustment with the coolant out and the hoses off fixed things.
Regards,
Shaun
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Peter Cripps
Re: Heater control valve
Thanks Shaun, that confirms what I suspected. Now all I have to do is find a valve!
You may remember that my Fulvia is a mixture of parts from different series. The heater parts were mainly S1, and I did find the hand wheel gismos under the steering wheel, not connected to anything. But it also has the later, and more conventional, slider dash control panel, which I'm hoping I can hook up to the S1 heater setup.
One problem is that the S1 heater appears to have 4 controls: open/close the intake flap, open/close the water valve, feet/windshield diverter, and heater core air bypass. The slider panel only has 3 levers, so something will have to be left out. Or maybe operated from a reinstalled hand wheel!
It also remains to be seen how long my patience lasts with all these cables ...
Peter
You may remember that my Fulvia is a mixture of parts from different series. The heater parts were mainly S1, and I did find the hand wheel gismos under the steering wheel, not connected to anything. But it also has the later, and more conventional, slider dash control panel, which I'm hoping I can hook up to the S1 heater setup.
One problem is that the S1 heater appears to have 4 controls: open/close the intake flap, open/close the water valve, feet/windshield diverter, and heater core air bypass. The slider panel only has 3 levers, so something will have to be left out. Or maybe operated from a reinstalled hand wheel!
It also remains to be seen how long my patience lasts with all these cables ...
Peter
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Tony Kovacevic
Re: Heater control valve
A common problem with the Ser1 heater valves is swelling of the rubber diaphragm that controls the water flow. I have seen them either block off the water flow resulting in no heating or not block off the water flow resulting in constant heat. The diaphragms can be easily replaced and are the same as a 105 Alfa.
Of course it could be the control cable, but that is another basket of snakes (pardon the pun)Peter Cripps wrote:
>
> Thanks Shaun, that confirms what I suspected. Now all I
> have to do is find a valve!
>
> You may remember that my Fulvia is a mixture of parts from
> different series. The heater parts were mainly S1, and I did
> find the hand wheel gismos under the steering wheel, not
> connected to anything. But it also has the later, and more
> conventional, slider dash control panel, which I'm hoping I
> can hook up to the S1 heater setup.
>
> One problem is that the S1 heater appears to have 4 controls:
> open/close the intake flap, open/close the water valve,
> feet/windshield diverter, and heater core air bypass. The
> slider panel only has 3 levers, so something will have to be
> left out. Or maybe operated from a reinstalled hand wheel!
>
> It also remains to be seen how long my patience lasts with
> all these cables ...
>
> Peter
Of course it could be the control cable, but that is another basket of snakes (pardon the pun)Peter Cripps wrote:
>
> Thanks Shaun, that confirms what I suspected. Now all I
> have to do is find a valve!
>
> You may remember that my Fulvia is a mixture of parts from
> different series. The heater parts were mainly S1, and I did
> find the hand wheel gismos under the steering wheel, not
> connected to anything. But it also has the later, and more
> conventional, slider dash control panel, which I'm hoping I
> can hook up to the S1 heater setup.
>
> One problem is that the S1 heater appears to have 4 controls:
> open/close the intake flap, open/close the water valve,
> feet/windshield diverter, and heater core air bypass. The
> slider panel only has 3 levers, so something will have to be
> left out. Or maybe operated from a reinstalled hand wheel!
>
> It also remains to be seen how long my patience lasts with
> all these cables ...
>
> Peter
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Peter Cripps
Re: Heater control valve
Tony, thanks. Just to clarify, right now there is no heater valve ... there never has been one since I've owned the car. You mention that the diaphragm is the same as the Alfa 105 series - I don't suppose that means that the valve itself is the same as well?
Peter
Peter
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Huib Geurink
Re: Heater control valve
The S1 valve is on top of the left inner wing. As Saun says the diafragm needs to be checked. It does not only swell but may also tear in which case you quickly loose the coolant. It is operated by a cable from a short lever on the side of the control panel with the rotary knobs.
On the S2 the valve is bolted onto the heater unit on the right hand side under the dash. The top lever on the dash operates both the by pass flaps and the valve.
Early (1965 and 1966) S1 heaters have no flap to control air to the windshiel. Air to the feet is controlled simply by opening or closing the small outlet flaps. Later (1967 and later) S1 heaters have a flap to control air to the windshield. It is operated by a lever under the blue and red knob which acts on both the flap to the top and the flap to the feet.
Blue knob: controls intake flap. CCW is open. CW is closed. Just like a jar of peanut butter.
Red knob: controls by pass flap. CCW is hotter. CW is colder.
Small lever on the side: controls valve.
Some modern cars have electrically controlled valves. An option is to mount one of those and mount a microswitch operated by the top lever. Mount it such that the valve is closed when the lever is fully to the left. In any other position of the lever the valve should be open.
On the S2 the valve is bolted onto the heater unit on the right hand side under the dash. The top lever on the dash operates both the by pass flaps and the valve.
Early (1965 and 1966) S1 heaters have no flap to control air to the windshiel. Air to the feet is controlled simply by opening or closing the small outlet flaps. Later (1967 and later) S1 heaters have a flap to control air to the windshield. It is operated by a lever under the blue and red knob which acts on both the flap to the top and the flap to the feet.
Blue knob: controls intake flap. CCW is open. CW is closed. Just like a jar of peanut butter.
Red knob: controls by pass flap. CCW is hotter. CW is colder.
Small lever on the side: controls valve.
Some modern cars have electrically controlled valves. An option is to mount one of those and mount a microswitch operated by the top lever. Mount it such that the valve is closed when the lever is fully to the left. In any other position of the lever the valve should be open.
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Tony Kovacevic
Re: Heater control valve
Peter, the on/off heater valve for a Series 1 should be located on the LH side of the engine bay. As far as I know, It is not the same as the 105. I've found 2 pictures on google images but they I can't move them to this email. I've noted the links.
http://tbn0.google.com/images?q=tbn:KjV ... rvalve.jpg
http://tbn0.google.com/images?q=tbn:R8B ... valve2.jpg
http://tbn0.google.com/images?q=tbn:KjV ... rvalve.jpg
http://tbn0.google.com/images?q=tbn:R8B ... valve2.jpg
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Peter Cripps
Re: Heater control valve
Thanks Tony, those images are very helpful. I never thought of searching on Google, but now I see exactly what the valve looks like and how it's mounted!
Regarding the Alfa valve, the Giulietta heater valve is definitely not the same, although it could be used with some creative engineering. It is available new, though, which is a good point!
Anyway, it looks as if I have a line on a used S1 valve that can be refitted with a new diaphragm. I think this will be the best solution overall.
Peter
Regarding the Alfa valve, the Giulietta heater valve is definitely not the same, although it could be used with some creative engineering. It is available new, though, which is a good point!
Anyway, it looks as if I have a line on a used S1 valve that can be refitted with a new diaphragm. I think this will be the best solution overall.
Peter