Heater core shut off valve
Hey everyone!
I read somewhere on here that someone had put a valve on their heater core inlet hose. So that the hot water would not circulate in the heater core. I'm interested in this fix as summer approaches. My heater shut off is worn out and allows hot air into the cab all the time. My question: Will adding a valve in my system cause any problems? Any advice is much appreciated. |
Re: Heater core shut off valve
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I have run them for years with no problems. If you have AC in the truck it's worth every penny. When I installed the one in my 71 C 10 I got 5* more out of my AC.
Pictures are of the one in my Ramp truck.:chevy: |
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I've had one on my 69 Cougar for 20 years with no problems. I used a solder connection type brass ball valve and soldered on a couple inches of copper pipe and put two clamps on each side.
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So which line to you put it on, from the block or the Radiator?
I ask since the A/C shop put one on for me but it shuts off from the Radiator. Seems it would work better from the block side, in front of the vacuum control shut off valve. |
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Put the valve on the hose from the engine -- that is the heat source. The hose to the radiator is for water exiting the heater core.
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The vacuum shut off valve should be standard on an A/C truck. Basically does not matter what hose it is installed in, will stop the flow, in the heat side does make make sense.
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Ok, laugh at me...
This is to reduce hotness in the cab in the summer? I've seen them in a few trucks and wondered... |
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Now I need to decide when/if to move it over to the inlet/engine source side. It's one of those things I look at and scratch my head about .... "is that right?". At some point I suppose I'll just do it because it will get on my nerves LOL Edit: NM my hoses are actually correct. Quote:
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And they look good , Not like you stole the plumbing off your grandmothers water heater ! |
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ya, I am pretty sure you (or someone else) commented on one of my post where the A/C guy installed a setup much like Andy's. Which is exactly the same cut off valve I installed on my water heater LOL!
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Hey , it's your truck use whatever makes you happy . :uhmk:
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Well, I didn’t do it and I can say I was all that happy. But now I am, since I just changed it.
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Really appreciate the posts, stories, and replies.
Always learning from you all here. Happy Easter! Now I'm going to go shut off the hot water flow! |
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Your post helped me as much as you External - got me motivated to sort mine out! I even did a bit more rerouting and the inlet line isn't touching any of the A/C lines now. I also cut down the water reserve line as it was like a mile long - so it's nice and tidy all around on that side with water lines.
Have fun - the more you visit these forums the more you learn you need to do to your truck LOL! |
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If your looking for original GM look, early 60's AC cars ( I would start with Cadillac or Buick or Olds) had a vacuum shut off valve.
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I installed Vortec heads, which are lacking a coolant hole that older heads have for recirculation before the thermostat opens. I am relying on my heater core for recirculation, so installing a manual shutoff valve to the heater core would be a bad move in my case. I would have to install a thermostat bypass hose between the water pump and front of the intake manifold. I really don't like how those bypass hoses look. I will have to do that eventually though if I add AC to my truck.
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Well I was going to post something but I want since it's Easter Sunday.
Both my trucks perform well and I'll just leave it at that. There is always someone. Good luck with it. I hope you figure it out.:chevy: |
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I hope I didn't say anything that upset you. I was talking about the little hose people have to add to the front of the intake manifold when running Vortec heads on trucks with AC.
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Apparently some later model vehicles require flow on the path to the heater core or suffer cavitation issues. I recently learned this & was not aware. These set-ups actually have a bypass that stops flow to the heater core (similar to these cut-off valves) yet allows for the loop to still circulate.
I learned about them on various LS swaps I've seen on the web. |
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Can this be done on a non-ac truck ?
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SCOTI, I have the valve in my 71 C 10 with the vacuum valve in the other line with the LS 6.0 and not had any problems before. Can you share some links on the problems are symptoms of it.:chevy: |
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The first image below from Summit looks very close to the cross-over used with 60's 289 fnords. The other images, also on Summit are from 4 Seasons that have internal valves. 4 seasons has a variety of manual cross-over styles, also shown in Summit.
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The unit I've seen is a billet piece. Very clean unit. I'll post up the info as soon as I can access it but it's basically just a higher-end (and more expensive) version of the early variations in your provided link/s. |
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I had a primitive bypass set-up (as in using what I had available for free vs spending money for something that may not impact my issue) for my 74swb @ one point. I was struggling w/heat soak on the a/c & wanted to see if blocking the hot-water flow to the heater core helped. I built a similar, simple hand valve set-up as it's what I had available for testing. I knew there were early OE versions of a vacuum/temp actuated bypass valve (from GM) available but wasn't going to spend the money for one just to find out it didn't make a difference for my needs. |
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wait... what?? there's a valve that does this? :lol:
https://dl.dropbox.com/s/ukuze0103pn...17777.jpg?dl=0 |
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I believe the two types of vacuum operated valves for 67-72 trucks are different. If I recall correctly the early one without bracket is normally closed and later one with bracket is normally open. Both could be used together to create a bypass.
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I had a hard time getting mine to burb when I installed it. I finally had the front end jacked up and took the 2 small steam ports loose on the front of the engine. That seemed to do it. Haven't had any more issues since. That was back in 2014. That I know of any way the truck runs cool even with the AC on.:chevy:
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My 70 K10 is non a/c so I installed valve like Grumpy showed pic of. There is a vacuum operated valve for a/c trucks, but cant find a valve for mine, they dont make one? Or does heat lever control something other than a valve? thanks!
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Heat lever only controls a blend door on non-a/c trucks.
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If I paint my vise-grips silver, does that count as billet?
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Thanks, I wont pull box off firewall just to see whats there. The other problem is keeping fan switch adjusted, will get it right, but in a few hundred miles it gets finicky again, blue loctite on screws? Thanks again for reply!
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I screwed a stainless steel body, teflon seat ball valve into the intake manifold, and run the hose from it, with an elbow.
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Anytime you can replace a gate valve with a ball, good idea.
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