Heater Control Valve
Heater Control Valve
I WANT TO ELIMINATE THE Heater Control Valve , THERE ARE 2 HOSES COMING OUT OF THE HEATER CORE, 1 ACROSS THE VALVE PAN INTO THE VALVE, THE OTHER I THINK IS GOING DOWN RUNNING ACROSS THE FRAME INTO THE RADIATOR, BUT IT T's OF & GOES INTO THE VALVE, THEN THERE IS A HOSE COMING OUT OF THE VALVE BACK INTO THE INTAKE BY THE DISTRIBUTOR, WHAT DO I NEED TO DO?
Member
Joined: Jan 2006
Posts: 355
Likes: 2
From: Central California Coast SM
Car: 91 Z28 24th Anniversary
Engine: L98
Transmission: Auto
Axle/Gears: Posi 3.23
All the heater control valve does is, cuts off the flow of coolant to the heater core during MAX A/C, hence the vacuum hose to it. When the A/C is set to MAX, vacuum is sent to the valve and it closes. That's it. If it's leaking, then bypassing the valve is no big deal. If you use your A/C in MAX operation, you may want to replace it.
Member
Joined: Jan 2006
Posts: 355
Likes: 2
From: Central California Coast SM
Car: 91 Z28 24th Anniversary
Engine: L98
Transmission: Auto
Axle/Gears: Posi 3.23
What size engine? The 3 hose combination I can't see in my head. There's usually only 2, 1 in and 1 out. It could be a bypass hose while the valve is closed??? Does the heater valve have 2 or 3 connections? If only 2, then a small pipe could bypass it, alowing water flow through the heater core for heat.
I noticed the PM. I don't usually get them so I don't normally look for them.
I noticed the PM. I don't usually get them so I don't normally look for them.
it is a 305 code e
1 hose out of the heater core ,looks to go down to the frame & back up to the rad.., but that hose Ts of & goes up to the heater valve,
the other hose out of the heater core goes along the valve pan to the heater valve, the there is a hose coming out of the heater valve into the intake by the distributor, the valve has 3 hoses going to it
thanks
1 hose out of the heater core ,looks to go down to the frame & back up to the rad.., but that hose Ts of & goes up to the heater valve,
the other hose out of the heater core goes along the valve pan to the heater valve, the there is a hose coming out of the heater valve into the intake by the distributor, the valve has 3 hoses going to it
thanks
Supreme Member

Joined: May 2002
Posts: 1,333
Likes: 1
From: Texas
Car: 1991 Z28 Convertible
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.23 with Eaton posi
i'll tell you what though either way, you shouldnt drive that car if you have a leaky HCV. You probably know it already and dont mean to run you into the ground.
When old, those HCV inlet/outlets get really brittle and can snap off.
It happened to me on the highway, I redlined my temp guage very quickly and then blew a head gasket.
I guess you could pull the heater core hoses off and mount a u-shaped hose for those ports, then use a longer hose from the block and hide the HCV valve. Or I guess you could just plug that water outlet from the block.
When old, those HCV inlet/outlets get really brittle and can snap off. It happened to me on the highway, I redlined my temp guage very quickly and then blew a head gasket.
I guess you could pull the heater core hoses off and mount a u-shaped hose for those ports, then use a longer hose from the block and hide the HCV valve. Or I guess you could just plug that water outlet from the block.
Member
Joined: Jan 2006
Posts: 355
Likes: 2
From: Central California Coast SM
Car: 91 Z28 24th Anniversary
Engine: L98
Transmission: Auto
Axle/Gears: Posi 3.23
Now that you mention they crack, I do recall they're black plastic near the A/C compressor on the right side of the engine. And now I do recall there is one hose going down and two heading back along the valve cover area. Probably hard to find an adapter to replace it. Have you priced them? Probably the easiest fix.
Trending Topics
Junior Member
Joined: Mar 2006
Posts: 66
Likes: 0
From: Maine
Car: 1988 Chevrolet Camaro IROC-Z
Engine: TPI 5.7L (L98)
Transmission: Automatic w/OD (700R4)
Axle/Gears: Stock Axle 2.77 gears
I got the price, 23 bucks at a typical parts store, 40 retail at the dealership. I got one coming tomorrow, because mine snapped off where it connects to the intake. Stupid plastic crap.
Thread
Thread Starter
Forum
Replies
Last Post
1992 Trans Am
History / Originality
27
May 10, 2023 07:19 PM
The_Phoenix
Interior Parts for Sale
12
Feb 4, 2016 07:10 AM
New2Chevy
Engine/Drivetrain/Suspension Parts for Sale
2
Sep 28, 2015 12:35 AM





