Topic: Help Identifying Water Shut off Switch
in Forum: C3 Cooling and Heating Systems
Already a Member?
Click Here to Login
Not yet a Member?
Click Here to Register for Free!
Lifetime MemberLemon Grove, CA - USA
Joined: 10/17/2007
Posts: 2041
Vette(s): 1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.
I'm working on my heater AC system. Started with the vacuum and controls before I let the AC guys fix the AC. By the way I get to stay with R12 as I purchase a dozen cans the week before they stopped selling it.
|UPDATED|4/22/2013 9:43:01 AM (AZT)|/UPDATED|
My problem is the white vacuum switch that is up under the dash on the heater box. The one that controls the vacuum to the Water Shut off Valve in the engine compartment is leaking vacuum like a sieve.
I have 12 inches of vacuum from the engine and after isolating everything but that switch and taking a reading on the hose going to the Hot water shut off valve get only 2 inches of vacuum.
Try as hard as I can I cannot seem to find anyone that has that switch. They must be calling it something else. What would you call it? I would like to purchase a new one if possible. I know I can get a used one locally but I would rather have new.
HVAC vacuum diagram
(large image modified to link-aapple)
HVAC vacuum diagram
(large image modified to link-aapple)
|UPDATED|4/22/2013 9:43:01 AM (AZT)|/UPDATED|
SPONSOR AD:: (Our Sponsors help support C3VR)
Do you think this is it? http://shop.docrebuild.com/1980-1982CorvetteACHotWaterControlVacuumSwitchGenuineGM14009284NOSS.aspx
If so, other vendors should have it too - good luck 
Lifetime MemberLemon Grove, CA - USA
Joined: 10/17/2007
Posts: 2041
Vette(s): 1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.
That does not look exactly like mine but that sounds like the item.
If I understand this system a leak here seems to be a direct connect to the rest of the vacuum system in the car.
The crossfire system is really susceptible to vacuum leaks. So I hope when I fix this it may also help with some other small issues. Of course I have never found a complete drawing of all Vacuum systems and how they actually connect or do not connect together.
Each time I find a new information I try to redraw it so it is easier for me to understand.
Thanks for the lead if no one else comes up with the exact item this should work. Mine does not have the big black thing sticking up is what the difference seems to be.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The big black thingy is an aspirator..or a vent of sorts, to allow vacuum to move the valve from one end to the other.Unless you can find a good used one, this one is prolly yer best bet on finding one. A used one may well have the same issues your original one does....it's dried out, and not sealing....
On another note...that's a SWEET diagram, Gilbert!!
|UPDATED|4/22/2013 9:43:39 AM (AZT)|/UPDATED|
On another note...that's a SWEET diagram, Gilbert!!
|UPDATED|4/22/2013 9:43:39 AM (AZT)|/UPDATED|
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberLemon Grove, CA - USA
Joined: 10/17/2007
Posts: 2041
Vette(s): 1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.
Thanks for the information Joel. You stated what a lot of people say that good used ones are hard to find. That is why I was looking for a new one. I will go ahead and order this then.
|UPDATED|4/22/2013 9:52:09 AM (AZT)|/UPDATED|
|UPDATED|4/22/2013 9:52:09 AM (AZT)|/UPDATED|
That's great news - as far as a vacuum diagram, you may want to check at the same place. They're noted for their knoweledge, various diagrams and details on these cars. Although it doesn't look like you need much help with a diagram.
Good luck, let us know how you make out. 
not sure if you found it yet at zip it is item # ww-239 69-72 Windshield Wiper Arm & 77-79 AC Water Shut-Off Vacuum Valve I think it showed out of stock if they are the same valve at mid america it is item 617-169 under wiper system
It seems it is decribed as Hot water shutoff valve or Hot water shutoof switch
|UPDATED|4/22/2013 3:10:23 PM (AZT)|/UPDATED|
|UPDATED|4/22/2013 3:10:23 PM (AZT)|/UPDATED|
Former Member
Send PM
Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
Willis76 said: That's great news - as far as a vacuum diagram, you may want to check at the same place. They're noted for their knoweledge, various diagrams and details on these cars. Although it doesn't look like you need much help with a diagram.
Good luck, let us know how you make out.
Sounds like you are putting out good information, Dennis!!
Dan
Lifetime MemberLemon Grove, CA - USA
Joined: 10/17/2007
Posts: 2041
Vette(s): 1982 C3 Collectors Edition 44000 miles, sat in the sun most of its life, My wife purchased it for me for Father's Day in 2007 from her girlfriend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.
Dennis found the switch at DrRebuild for $65 I purchased that one.
Robert found that the wiper door switch could be used for this purpose at DrRebuild. I think that is good information for future reference and is just an example of the help that you can get from members.
Thanks again for coming through with help when needed.
Gil
in Forum: C3 Cooling and Heating Systems
SPONSOR AD: (Our Sponsors help support C3VR)