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12-08-2015, 11:12 PM
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#1
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3 Rivet Member
1976 28' Argosy 28
Dallas
, Texas
Join Date: Jun 2009
Posts: 120
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Heater Valve - need part #?
My heater valve has corroded through. I can't seem to find a replacement that uses the pull wire at Autozone, etc. I don't care about using an exact replacement if someone has an updated solution. 12V switch might work better anyway.. ? Anyone have a part#/vendor? Thanks
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12-09-2015, 05:14 AM
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#2
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Rivet Master
1982 31' Airstream 310
champaign
, Illinois
Join Date: Oct 2012
Posts: 4,072
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Google "push pull heater core valve" and youll get several hits.
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12-09-2015, 06:17 AM
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#3
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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This is the one you should use. It bypasses the heater core when heater control is all the way to cool.
Four Seasons 74643 Heater Control Valve
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-19-2015, 07:48 AM
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#4
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Rivet Master
1979 24' Airstream Excella 24
Tipp City
, Ohio
Join Date: Feb 2012
Posts: 551
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I replaced mine a year or so ago. Got it at O'riellys. As I remember the valve lever was the opposite so the cable had to be reworked. These are fun to install. Could they have put it in a more difficult location?
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12-19-2015, 09:22 AM
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#5
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Greg, any pictures of the install?
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-20-2015, 03:05 AM
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#6
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3 Rivet Member
1976 28' Argosy 28
Dallas
, Texas
Join Date: Jun 2009
Posts: 120
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Thanks for the info. I'm going to move mine down away from the top of the radiator.
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12-20-2015, 07:10 AM
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#7
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Rivet Master
1991 34' Excella
1963 26' Overlander
1961 26' Overlander
Central
, Mississippi
Join Date: Nov 2006
Posts: 5,919
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Quote:
Originally Posted by bkahler
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Brad,
I'm aware of a drawback to that style valve. If you have a heavy heat load, the heater water is bypassing the radiator and going back to the block.The style that simply shuts off the flow forces all of the coolant thru the radiator.
I ran into issues in street/racecars where they ran hot because of this but admittedly this was at the extreme end of the scale.
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12-20-2015, 09:53 AM
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#8
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Vernon, that's an interesting side affect of using the H valve.
I wonder if in addition to the H valve add a manual shut off valve inline with the heater hose to totally shut off flow. A lot of motorhome owners already add the manual shutoff valve that is accessed from under the hood.
Thanks for the tip!
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-22-2015, 06:46 PM
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#9
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Rivet Master
1979 24' Airstream Excella 24
Tipp City
, Ohio
Join Date: Feb 2012
Posts: 551
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Quote:
Originally Posted by bkahler
Greg, any pictures of the install?
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Found these, does that help?
As I recall the hose near the Prestone tee connects to the valve right inside the firewall then there is a couple inches of hose connecting directly to the heater core.
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12-22-2015, 06:51 PM
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#10
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Rivet Master
1979 24' Airstream Excella 24
Tipp City
, Ohio
Join Date: Feb 2012
Posts: 551
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Quote:
Originally Posted by bkahler
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Brad, How does this valve work? Does it divert the water flow directly to the return hose? What would be the advantage of that? Looks like my valve stops flow to the heater core thus stopping all circulation.
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12-22-2015, 07:06 PM
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#11
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Greg, as the valve goes closes the H style starts diverting coolant back to the radiator instead of blocking off flow which creates a dead head in the line. Eventually all of the flow would be diverted to the block and flow to the heater core would be blocked.
This valve was a recommended field upgrade by GM for the P-30 chassis although HiHoAgRV indicated that this could also cause over heating of the engine in some high stress applications.
I'll try and find the document that GM provided and post it. It may already be posted on Airforums but I don't know when or by who.
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-22-2015, 07:07 PM
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#12
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Quote:
Originally Posted by Gregsch
Found these, does that help?
As I recall the hose near the Prestone tee connects to the valve right inside the firewall then there is a couple inches of hose connecting directly to the heater core.
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For some reason I thought you were installing the H style of valve.
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-23-2015, 01:06 PM
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#13
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Quote:
Originally Posted by Gregsch
Brad, How does this valve work? Does it divert the water flow directly to the return hose? What would be the advantage of that? Looks like my valve stops flow to the heater core thus stopping all circulation.
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Greg, here's a little more info on the H valve. I copied this image from this thread.
The page is also included in the Chevrolet Motorhome Chassis Service Guide.
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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12-24-2015, 01:43 AM
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#14
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2 Rivet Member
1977 24' Argosy 24
Hilden
, NRW
Join Date: Dec 2014
Posts: 90
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Hi all
I discovered this week that my heater core is leaking, and many, is that this broken, why carpet was wet all the time.
so now I looked, and I find the right size or if I find out the extent of the tubes are different and then I'll have problems with the valve.
someone has an address where to get the original?
thanks
herman
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12-24-2015, 06:41 AM
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#15
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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Herman, sorry to hear abut the problems with your heater.
This place Acme Air Parts is the only source I know of for heater parts for our motorhomes. They don't have everything but hopefully they will have what you need.
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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