Heater vacuum shut off valve
Thread Starter
Intermediate
Joined: Nov 2009
Posts: 32
Likes: 3
Heater vacuum shut off valve
I had a defective heater vacuum shut off valve with rotten hoses on top of it. I replaced the switch and the hoses. The problem I now have is the valve doesn't release vacuum. In other words, once you turn it on cold, it stays on cold until you pull the hose off the heater valve. And yes the hoses are on the correct ports.
Safety Car
Joined: Oct 2007
Posts: 4,383
Likes: 1,755
From: Seattle Area Washington
I had a defective heater vacuum shut off valve with rotten hoses on top of it. I replaced the switch and the hoses. The problem I now have is the valve doesn't release vacuum. In other words, once you turn it on cold, it stays on cold until you pull the hose off the heater valve. And yes the hoses are on the correct ports.
The black line is manifold vacuum, the white line goes to the shutoff valve.
To me, sounds like the switch exhaust port is blocked or switch is faulty.
Last edited by bmotojoe; Oct 31, 2021 at 01:17 PM.
Racer
Joined: Jan 2017
Posts: 271
Likes: 120
From: Rock Hill South Carolina
I replaced that irritating vacuum switch with an electric solenoid, and triggered it with a push button mounted in the body of the vacuum switch. Much more reliable and the temp control lever is easier to move to the end of its travel.
https://www.corvetteforum.com/forums...ic-switch.html
https://www.corvetteforum.com/forums...ic-switch.html
Le Mans Master
Joined: Jun 2019
Posts: 7,670
Likes: 2,474
From: Indiana
I replaced that irritating vacuum switch with an electric solenoid, and triggered it with a push button mounted in the body of the vacuum switch. Much more reliable and the temp control lever is easier to move to the end of its travel.
https://www.corvetteforum.com/forums...ic-switch.html
https://www.corvetteforum.com/forums...ic-switch.html
Racer
Joined: Jan 2017
Posts: 271
Likes: 120
From: Rock Hill South Carolina
Glad you liked it 🙂. Yes, it’s still working just fine. I did go back and install an electronic relay to protect the switch as I mentioned in the thread - I didn’t want to do the job again if the switch burned up. I should update my write up to include that info.
I know the solenoid operated valve exhausts, but my memory is a little foggy on exactly where the exhaust port is. I think it’s between the input and output nipples. That was one of the selection criteria, since the original system depends on an exhaust to allow the water valve to return to the open position.
I know the solenoid operated valve exhausts, but my memory is a little foggy on exactly where the exhaust port is. I think it’s between the input and output nipples. That was one of the selection criteria, since the original system depends on an exhaust to allow the water valve to return to the open position.
