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| Matatk | Heater core bypass valve | ||
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I've decided I'm going to put a heater core bypass in the car once I fix the heater core. The motor runs cooler without the heater core in play for some reason (probably the old one was blocked and restricting flow). I also know it should help with the a/c once I repair that.
There is the cheap way which is just an inline on/off petcock or valve. Here is an example:  I don't want that. I want the heater core to flow but have a wire activated (or manual) bypass like a factory installation. I know GM uses these. Here is an example:   This is a GM /Ac-Delco heater control valve for a 1995-2000 Chevy Tahoe V8. As you can see it has 4 ports on it. This still allows coolant flow (for example a cool morning) until the solenoid closes it and bypasses the heater core. I think this would be better to prevent the heater core from sitting unused and getting gunked up/corroded (perhaps?). Here is an example of that style valve on a C3 but it is from a ford ranger:  Ultimately I'm wodering if anyone has done this and has specific experience with the valve. I don't want a vacuum activated valve (like the older C3s). I am pretty sure the solenoid on a newer style valve is simply a power/ground switch. Comments? Matthew |
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Posted on: 2012/5/22 12:32
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: Heater core bypass valve | ||
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Edit: I don't think a ballcock style heater core bypass will affect the oil cooler. I'll have to look at the lines on the car, the pictures are not 100% clear.
Attach file:  89 Corvette Coolant Lines 1.jpg (0.00 KB) 89 Corvette Coolant Lines 2.jpg (0.00 KB) 89 Corvette Coolant Lines 3.jpg (0.00 KB) 89 Corvette Coolant Lines 4.jpg (0.00 KB) |
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Posted on: 2012/5/22 12:35
Edited by Matatk on 2012/5/22 13:18:56 Edited by Matatk on 2012/5/22 13:20:16 |
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: Heater core bypass valve | ||
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Quote:
I don't think that would be it, Possibily just changing the coolant/removing a bit of air made it run cooler. But a blocked core either with crud or a closed valve shouldn't have an effect. Actually running thru the core should slightly decrease temps. I mean, the core is just another radiator. I agree on running coolant thru the core vs not. The Tahoe valve should work but I'd check the schematics to see if there's a relay. I'd think the valve/relay would be powered all the time and turned on by grounding (by an ECM signal). So a switch in the cab would just go to ground. BTW, LT1's flow all the time, no valves at all just a restrictor. Heat into the cab is controlled by doors. |
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Posted on: 2012/5/22 14:53
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| Matatk | Re: Heater core bypass valve | ||
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Bill - I didn't change the fluid when I did the loop, and the radiator was properly packed already. I can't explain with certainty why it runs cooler, but the oil is by at least 10 degrees and the coolant is, too.
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Posted on: 2012/5/22 16:09
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| Matatk | Re: Heater core bypass valve | ||
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Quote:
The old C4s came with a vacuum activated valve. I think it was eliminated in 1988 and then there is just a blend door. But you still have 200 degree coolant under the dash regardless of the blend door that radiates heat. I'd like to eliminate that element. Also, I don't know where to get my hands on the tahoe schematics. Anyone? Matthew |
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Posted on: 2012/5/22 16:11
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: Heater core bypass valve | ||
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Yea, I know about the valve. Doesn't seem to effect the LT1's inside the cab but I have no idea why. Betcha Rick can come up with the schematic. |
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Posted on: 2012/5/22 16:27
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| Matatk | Re: Heater core bypass valve | ||
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So I did find out the Tahoe uses a vacuum controlled bypass.
Found this full kit with wiring and everything, but I'm not spending $86 + S&H on it: http://www.chevsofthe40s.com/detail/1 ... ROL_VALVE_ELECTRONIC.html |
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Posted on: 2012/5/22 16:28
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| Matatk | Re: Heater core bypass valve | ||
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Here is an example of the vacuum activated valve:
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Posted on: 2012/5/22 16:29
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| Matatk | Re: Heater core bypass valve | ||
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And I did find the schematic. I think it is an electronic switch that then applies vacuum but has to already have a vacuum source. Why make it more complicated than it needs to be???
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Posted on: 2012/5/22 16:33
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| flyboy | Re: Heater core bypass valve | ||
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Might keep the cabin a little cooler, huh?
Only experience I have with them is when they stick or leak. The one on my Caprice is vacuum operated, replaced twice. Matt, where did those neat diagrams in your second post come from. Me want some. |
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Posted on: 2012/5/22 16:37
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| BillH | Re: Heater core bypass valve | ||
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The Stig Moderator
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Move the heater core to the other side of the firewall then. heat in the cabin won't be a problem.
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Posted on: 2012/5/22 16:46
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| Matatk | Re: Heater core bypass valve | ||
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More info. Found a truck site link that has the same info I'm looking for. It does involve an electric solenoid that applies vacuum to the bypass. The solenoid is another $40 on top of the bypass. Things add up quick. I guess an $8 trip to HD might be the fix.
http://www.amazon.com/Standard-Motor- ... TF8&qid=1332998192&sr=1-2 http://www.fullsizechevy.com/forum/ge ... ontrol-valve-install.html |
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Posted on: 2012/5/22 16:58
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| BillH | Re: Heater core bypass valve | ||
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Why not just go to the boneyard and rip one off a Tahoe for a couple bucks?
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Posted on: 2012/5/22 17:00
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| Matatk | Re: Heater core bypass valve | ||
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Quote:
Found them on a gm parts website. http://corvetteparts.com/catalog/cool ... s-lines/?q=heater%20hoses They are listed as thumbnails under the parts. |
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Posted on: 2012/5/22 17:03
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: Heater core bypass valve | ||
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Good Gawd, the one on the Silverado is insane, vacuum valve, servo motor valve and relay.
Attach file: 2006-09-16 02-40-05_0002.JPG (0.00 KB) |
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Posted on: 2012/5/22 17:08
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| Matatk | Re: Heater core bypass valve | ||
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That's a good idea. If they have any. Not sure if it's all worth it after this! Matthew |
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Posted on: 2012/5/22 17:19
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: Heater core bypass valve | ||
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Yea, just look at my pic, it would be hard to fit all that crap under the hood. I can't even figure out why there's a vacuum valve AND a servo (and I don't really want to know  ).A Tahoe has to be the same as my Silverado. That $86 is starting to look pretty good. |
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Posted on: 2012/5/22 17:23
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| Matatk | Re: Heater core bypass valve | ||
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Exactly. More junk to break. Plus I don't know if the junkyard stuff would even work. That $6 HD valve is starting to look pretty good. |
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Posted on: 2012/5/22 17:36
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