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Author Topic: Heater Control Valve  (Read 3581 times)
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Angle Grinder
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« on: 26 July, 2012, 09:33:46 AM »

My heater control valve has developed a leak and appears to be losing water from the top of the valve where the shaft of the lever goes through the top cover plate.

If I leave the valve open, it doesn't seem to leak or at least it leaks very little, but with the valve shut there is a steady drip.

Leaving the valve open all the time is not a favoured option as my car has a new heater matrix and it really works very well so you soon heat up in summer (such as it is). My question is whether or not anyone has experience of overhauling these valves?

From other threads on this forum, I have the impression that there is some sort of diaphragm within the control valve and I guess the lever action of the valve translates into the flexing of this diaphragm. If that is the case, my diaphragm may have perished.

Just looking for some guidance before I start dismantling the valve as I suspect there will be some crumbling pieces inside.


* Heater valve.jpg (545.3 KB, 1824x1368 - viewed 319 times.)
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Current Cars: 1994 2.0 VIS Thema Station Wagon, 1967 Flavia 1.8 PF Coupe.

Previous cars:
1983 Prisma 1600
1991 Thema 16v i.e. SE
1988 Thema 8v Turbo
1992 Thema 16v i.e.
1983 Gamma Coupe (manual)
1993 Thema VIS
1994 Thema VIS LE
1990 Thema 2.8
St Volumex
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« Reply #1 on: 26 July, 2012, 01:28:48 PM »

Yes, there is a diaphragm inside which is open and shut by a spiral groove in the lever which engages a pin and moves slightly up and down - the valve is similar to those on the Appia.

I may be able to help you with NEW original parts.

Regards,
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Guy McDougall
www.facebook.com/RetroPart
Rare Parts for Rare Machines
Appia Coupé S3 (Rosina), Appia Berlina S3 (La Giaconda), Fulvia 1.3S 5 spd coupé (Tigger, belongs to Carol), Beta Spyder S2 (Vivaldi), Montecarlo Spyder S2, HPE VX (Pugsly) etc
Angle Grinder
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« Reply #2 on: 26 July, 2012, 06:14:45 PM »

So it isn't likely that I'll be able to repair this then? Sounds like the seal between the "worm" mechanism and the diaphragm must have gone. I'll see if I can dismantle it and maybe effect some sort of temporary repair
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Current Cars: 1994 2.0 VIS Thema Station Wagon, 1967 Flavia 1.8 PF Coupe.

Previous cars:
1983 Prisma 1600
1991 Thema 16v i.e. SE
1988 Thema 8v Turbo
1992 Thema 16v i.e.
1983 Gamma Coupe (manual)
1993 Thema VIS
1994 Thema VIS LE
1990 Thema 2.8
fay66
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« Reply #3 on: 26 July, 2012, 08:24:31 PM »

So it isn't likely that I'll be able to repair this then? Sounds like the seal between the "worm" mechanism and the diaphragm must have gone. I'll see if I can dismantle it and maybe effect some sort of temporary repair
Looks the same as my spare for my Series 1 Fulvia Berlina that I'm looking at, originally back in 1999 Omicron carried the diagphrams to repair these so worth checking with them.
Brian
8227 Cool.
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
1999 Suzuki Wagon R+ GL, now my daughters
2006 Renault Megane 1 5 Dci Sports Tourer
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Angle Grinder
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« Reply #4 on: 27 July, 2012, 10:27:58 AM »

You're right Brian. Omicron have them for £15.41 plus vat & postage.
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Current Cars: 1994 2.0 VIS Thema Station Wagon, 1967 Flavia 1.8 PF Coupe.

Previous cars:
1983 Prisma 1600
1991 Thema 16v i.e. SE
1988 Thema 8v Turbo
1992 Thema 16v i.e.
1983 Gamma Coupe (manual)
1993 Thema VIS
1994 Thema VIS LE
1990 Thema 2.8
Angle Grinder
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Posts: 395



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« Reply #5 on: 29 July, 2012, 04:30:22 PM »

Fixed!!!

Easy fix too... £21 for a wee piece of rubber from Omicron... loosen 4 x 7mm nuts underneath valve... unscrew 4 screws on top cover (taking care not to lose nuts)... slip off nasty perished 45 yr old (?) piece of rubber... prise new rubber diaphragm onto plunger... re-assemble... test and smile!!!  Grin

If only modern cars were this easy to work on!



* Heater control valve changed.jpg (238.88 KB, 1280x960 - viewed 348 times.)
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Current Cars: 1994 2.0 VIS Thema Station Wagon, 1967 Flavia 1.8 PF Coupe.

Previous cars:
1983 Prisma 1600
1991 Thema 16v i.e. SE
1988 Thema 8v Turbo
1992 Thema 16v i.e.
1983 Gamma Coupe (manual)
1993 Thema VIS
1994 Thema VIS LE
1990 Thema 2.8
fay66
Permanent resident
**
Posts: 5866



« Reply #6 on: 29 July, 2012, 11:33:45 PM »

Fixed!!!

Easy fix too... £21 for a wee piece of rubber from Omicron... loosen 4 x 7mm nuts underneath valve... unscrew 4 screws on top cover (taking care not to lose nuts)... slip off nasty perished 45 yr old (?) piece of rubber... prise new rubber diaphragm onto plunger... re-assemble... test and smile!!!  Grin

If only modern cars were this easy to work on!



Hi Mike,
Pleased to see you've fixed the problem and while I know it wasn't cheap buy, but what would you done if one wasn't available whatever the cost Huh?

Brian
8227 Cool
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
1999 Suzuki Wagon R+ GL, now my daughters
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
HF_Dave
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Rust , What Rust !! I don't See any rust !!!


« Reply #7 on: 01 August, 2012, 10:24:17 PM »

On my HF Coupe the valve has been replaced with a water valve just like the one you find behind the washing machine in your kitchen ! I bought the  car with this mod and it has worked fine as the cable to operate it sits in the slot of the lever and works very well. I don't think I would have come up with that idea myself. I must admit I was impressed when I saw it.  Smiley
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My Current Cars:
1997 Ypsilon 1.2 16v
2003 Ypsilon 16v
1989 Thema 16v

1977 Beta sedan 2000
1975 Fulvia S3 1.3
1973 Flavia HF 2000 Coupe
1972 Fulvia S2 1.3
1989 Thema 8.32
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2008 Fiat 500
2006 Fiat Croma
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« Reply #8 on: 03 August, 2012, 05:31:32 AM »

Hi Mike,
Pleased to see you've fixed the problem and while I know it wasn't cheap buy, but what would you done if one wasn't available whatever the cost Huh?

Brian
8227 Cool

Brian, if they were not available www.facebook.com/RetroPart would be making them, and ours are half that price...  Grin
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Guy McDougall
www.facebook.com/RetroPart
Rare Parts for Rare Machines
Appia Coupé S3 (Rosina), Appia Berlina S3 (La Giaconda), Fulvia 1.3S 5 spd coupé (Tigger, belongs to Carol), Beta Spyder S2 (Vivaldi), Montecarlo Spyder S2, HPE VX (Pugsly) etc
fay66
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Posts: 5866



« Reply #9 on: 03 August, 2012, 07:26:56 AM »

Hi Mike,
Pleased to see you've fixed the problem and while I know it wasn't cheap buy, but what would you done if one wasn't available whatever the cost Huh?

Brian
8227 Cool

Brian, if they were not available www.facebook.com/RetroPart would be making them, and ours are half that price...  Grin
Guy,
sorry Embarrassed I should have course mentioned retropart as well.
Brian
8227 Cool
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
1999 Suzuki Wagon R+ GL, now my daughters
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
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