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Rank: Ingegnere
Joined: 7/27/2005
Posts: 500
Location: Manchester U.K.
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Jaques
I hope I am not hi-jacking your topic but the heater valve topic needs to be separated from the chain tensioner thread.
My car (15989) has two water control valves, one on either side controlled by the two lower levers 43 & 51 in the Owners
manual onthe ski-slope. The water heater connection at the back of the left cylinder head is a banjo connection. with two outlets
one going to each of the small heater radiators situated below each heater valve.
My parts book for GTC4 shows the twin outlet at the rear of the left cylinder head (Tav 5 n. 53)
On the GT4 2+2 there is only one water heater valve which is behind the left cylinder head controlled by the right hand lower
lever( 51 in the GT4 2+2 Ownershandbook) on the ski-slope which controls the water flow for both heater radiators & the left
hand lower lever on the ski-slope (43 in the GT4 2+2 handbook) operates the choke.
I think your car must have either of these arrangemen depite what you say about its hybrid late chassis number nature as if it
was fitted with all three valves there would only be two levers available to control them.
I just hope all this makes some sense & I have no diagrams in either of the parts books of the heater water circuits all the
information is in the Owners handbooks.
The 2+2 parts book shows the water control valve at the rear of the left cylinder head (Tav 5 n.26)
Regards
Ian L
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Rank: Ingegnere
Joined: 8/12/2007
Posts: 208
Location: Steinhuebeliweg 12, CH-3074 Muri, Switzerland
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Ian,
thanks for all your explanations. My car has the same heating system as yours. What makes me unsure is that in the parts book (revision Ottobre 1972) on Tav. 5, part 62 shows the valve on the back of the left cylinder head, "valid from 15 181 on and US cars with depurazione scarico".
I looked back in the Forum and found that on 06.18.2008 Aaron wrote :
“As I remember the heater valve, is attached to the back of the left head with two 6mm studs and a gasket.”
and
“I have a US car and it has only one heater valve located at the back of the engine block between the two distributors. You can tell if this is your configuration by the controls on your consol. If you only have one temperature control lever, then yours is the same.”
So, one problem seems solved : all US cars have one valve, Euro cars have two.
But until now I don’t have found the closing valve shown on Tav. 16/16A as # 57 on my car. As I understand the parts book all C/4s should have it. It can’t be hidden so that nobody can find it; some may close it in summer... This valve was later suppressed on the 2+2 and may be on my car already too.
Once again many thanks and regards, Jacques.
BTW, I find it great to have this Forum !!
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Rank: Ingegnere
Joined: 7/27/2005
Posts: 500
Location: Manchester U.K.
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Good morning Jaques
The more you search the more becomes the mystery. & as 151181 is the chassis number for the tensioner change.may be there were other
changes also.
I have looked in my other GTC4 parts bookat at revisions after October 1972 for RHD cars & it shows the single valve at the
back of the head.
I apologise to Aaron in that he has already described, much, much earlier, what I only posted yesterday & I don't understand why
I missed his original posting.
The closng tap 57 could be missing for a number of reasons as it only lies in line between two pieces of the same hose but It
may well have been omitted at manufacture as you say.
It could be that whatever was available in the parts bins at the time was used except the tappings at the rear of the cylinder
head are different for the valve & banjo & the heater lever/choke arrangements had to be changed also. Or that the chassis
numbers do not reflect the exact date or order of production.
I agree also that it shows clearly what a brilliant forum this is & that you should read all of Aaron's posts carefully as he
realhy has a great knowledge of our cars.
Regards
Ian
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Rank: Ingegnere
Joined: 7/27/2005
Posts: 212
Location: Washington DC
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Ian/Jaques: I am not sure that all US cars have one, mine a US car #14947 has two, I seem to remember from when I was on the hunt for my C4 that there was a specific serial number when the change to one valve occurred for the US cars, I am fairly certain that that Tom Welsh's C4 (US) has one. If you are searching for the closing tap, they are available from the Alfa parts suppliers at a fraction of the price demanded for the identical part by the Ferrari suppliers, M
Michael Bayer 330GT, 365GTC4, 2400 Dino Spider
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Rank: Ingegnere
Joined: 7/27/2005
Posts: 500
Location: Manchester U.K.
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Hi Michael
I think that change number could be from 15181.
Tom's car is 15319
Ian
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Rank: Ingegnere
Joined: 8/12/2007
Posts: 208
Location: Steinhuebeliweg 12, CH-3074 Muri, Switzerland
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Ian and Michael,
then it is probably so that from 15 181 on all US cars have one valve and all Euro C/4s two as before.
And Michael, thanks for the advice to search the valves at ALFA, I am sure I can get them here nearby.
Regards, Jacques
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Rank: Newbie
Joined: 2/18/2010
Posts: 6
Location: Vienna, VA
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Hello,
I am a brand new C/4 owner (
My car is wonderfully squared away in most respects, except for the heater controls. Yesterday I spent 5 hours trying to find all the valves shown in the owners manual (and parts manual, and repair manual) to no avail, and last night I found this thread. Eureka! Now I need to see if the valve is operable, and why the cable/lever are not!
I also need to find out why the left hand fan is not operating (the right one is), and check out the cables for the left/right air distribution. (At least my A/C works, but not of great interest in the Mid-Atlantic region right now!) Suggestions on troubleshooting the left fan??
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Rank: Ingegnere
Joined: 7/27/2005
Posts: 500
Location: Manchester U.K.
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Welcome to the site & congratulations on your very good taste in fine motor cars.
I would check out the switch above the ashtray before getting your hands really dirty as this was my problem but I checked out the fan first
You can get at the connecions by removing the ashtray & checkng the switch connections or whether the switch itself is OK
There is an unused simple on/off switch next to the L H fan switch (unless you have a heated front screen that is)
Regards
Ian L
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Rank: Newbie
Joined: 2/18/2010
Posts: 6
Location: Vienna, VA
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Many thanks Ian, I'll check this next. I did get the heater valve cable working - although I seem to be missing the cable housing clamp on the engine side and will have to fabricate one- and verified that the valve works. Is there a specific placed that the clamp should bolt to near the valve? Got plenty of heat on the right side, so if I can get the L fan going, and replace a couple of the duct hoses in the engine compartment, should be good to go!
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Rank: Newbie
Joined: 2/18/2010
Posts: 6
Location: Vienna, VA
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Update on my heating system projects: Left fan had bad ground wire (also left front marker light shares the same ground point, and it too was not working), so now its working. All fresh air hoses have now been replaced, and we have very nice heat - both sides! Only remaining task is the broken wire on the left side air distribution lever.
With snows here in mid-Atlantic region mostly off the roads, I was able to take my first drive for 8 miles with heat!
Alan (newc/4guy)
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Rank: Ingegnere
Joined: 7/27/2005
Posts: 212
Location: Washington DC
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Alan (newc/4guy) you are close I and my C4 are in Georgetown how can I help? Hve been through the conteols exercise a few years ago! Micheal Bayer
Michael Bayer 330GT, 365GTC4, 2400 Dino Spider
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