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#1028537 - 08/25/15 04:18 AM Heater Control Valve  
Joined: Nov 2008
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jmireles Offline
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jmireles  Offline
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El Paso, Tx
As I was plumbing in the heater hoses on my LS2 swap, I noticed the heater control valve was a bit crusty and rusty and wanted to change it. I haven't tried applying vacuum to see if it'll hold or even if the valve will move. Now for the problems:
This is the heater valve I have on the Monte



I'm not sure if its the original one but I've had the car 11 years and have not replaced it. So I went online to look for a replacement but they pretty much all look like this...

http://www.oreillyauto.com/site/c/search...;make=Chevrolet

I then started thinking I might not have the right part on the car but I've looked at some low mileage Montes like this one, where it clearly show the same valve as on my car.



I imagine I could get that plastic looking valve and call it a day but I'd rather have OEM replacement. I've tried looking but haven't come up with what I want.

Are they available??

Also, after having looked at the picture of the low mile monte and others, my heater valve is on the wrong line!! Does having it switched affect performance? I'm switching it back but was curious.

Thanks for the help, fellas.


-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes
-'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K
-'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback
B & M shift Kit 400 Turbo trans. Edel brock Performer
RPM Intake Sean Murphy built Rochester Carb. Restored
in '08. 3K
#1028565 - 08/25/15 05:26 PM Re: Heater Control Valve [Re: jmireles]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
Plastic is what the aftermarket sells, did you try Mike's Monte's? the heater hoses are different sizes IIRC.


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1028570 - 08/25/15 06:22 PM Re: Heater Control Valve [Re: jmireles]  
Joined: Sep 2011
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LXXXIV SS Offline
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LXXXIV SS  Offline
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Lower Peninsula, Michigan
Here's my stock 1984 SS valve


#1028571 - 08/25/15 06:53 PM Re: Heater Control Valve [Re: jmireles]  
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jmireles Offline
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jmireles  Offline
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Posts: 647
El Paso, Tx
That's like the one I have too.

Leo,
I haven't tried Mike's yet but I'll give him a call today.


-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes
-'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K
-'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback
B & M shift Kit 400 Turbo trans. Edel brock Performer
RPM Intake Sean Murphy built Rochester Carb. Restored
in '08. 3K
#1028579 - 08/25/15 08:01 PM Re: Heater Control Valve [Re: jmireles]  
Joined: Aug 2001
Posts: 13,722
mannblk Offline
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mannblk  Offline
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NC
I replaced one a few years back with the newer plastic unit. No issues with it and honestly after the air cleaner and hoses are all done, doesn't stick out as much as the old metal unit.


Jeff

I know I don't get there often enough, but God knows I surely try.
It's a magic kind of medicine, that no doctor could perscribe.
Jimmy Buffett One Particular Harbor
#1028783 - 08/31/15 05:24 AM Re: Heater Control Valve [Re: jmireles]  
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jmireles Offline
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jmireles  Offline
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El Paso, Tx
I tried going through Mike but he didn't have any OEM. So I took the Dremel and an 80 grit flap wheel and just cleaned it up.



It only took about 10 inches of vacuum to get it to fully open and held at 19 inches, so I decided to not replace it.



-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes
-'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K
-'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback
B & M shift Kit 400 Turbo trans. Edel brock Performer
RPM Intake Sean Murphy built Rochester Carb. Restored
in '08. 3K
#1050015 - 04/16/17 05:21 AM Re: Heater Control Valve [Re: jmireles]  
Joined: Apr 2006
Posts: 254
Andy85SS Offline
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Milwaukee, WI
Yea, I know this thread is 2 years old, but I was looking for a metal heater valve too. The aftermarket plastic replacements have been lasting 3-4 years for me and then they always start leaking from the diaphragm. After some hunting on google and ebay, I came up with the following part numbers 5910 & 74671 - they're often listed as interchangeable. Autozone carries the 5910:

http://www.autozone.com/cooling-hea...s-everco-heater-control-valve/846444_0_0

I'm going to check it out Monday and see if it'll work. Slightly different than the oem, but all metal none the less. As long as the in/outs are 5/8", it sb okay. Even if they're 3/4", I don't believe it should matter if the valve is installed on the supply or return line for the heater core anyway.

#1050016 - 04/16/17 06:45 AM Re: Heater Control Valve [Re: jmireles]  
Joined: Jan 2008
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confusion101 Offline
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confusion101  Offline
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Posts: 439
Calgary, Alberta
Hate to hijack this thread, Not to sure about the Control Valve, as mine is rusty and dirty looking as well. Not sure how if its on the in or out host to the heater core.

But i figured instead of making a new thread, Maybe someone would have a more clear opinion on this subject, In the OP picture, I have circled where the lines go to the heater core, in orange'ish red color, and also where i forget the name the air conditioning metal cyclinder tube goes as well. Anyways, I changed my heater core about 3 or 4 months ago, after getting it all back together. In those 2 redish orange circled area's, there was just a weird dirty old sponge type material. Now after getting it all back together, whenever i am running my heater... I can feel Air blowing out in the direction indicated by the yellow arrow's... and i never noticed that before.

Now i notice in the OP's picture.. where the A/C lines run in, its all literally sealed right up tight with what looks like some black globby type of glass butyl sealant material.

I am just curious should i feel air blowing out of these 2 area's? or should i really seal them up air tight, would this cause me to be loosing heat/blowing pressure for my heater in the car? Or is this a normal breathing type of operation for the heater housing unit, or maybe i just screwed up when i put it all back together. Anyways sorry to hijack this thread, just figured it was some what related.

I also notice in the OP's picture he has just a huge opening gap for the in and out lines to the heater core, no sealant or spongy type material at all? So now im just confused, if that was taken out for some reason? lol

[Linked Image]

Last edited by confusion101; 04/16/17 06:47 AM.
#1050025 - 04/16/17 03:37 PM Re: Heater Control Valve [Re: jmireles]  
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mmc427ss Offline
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mmc427ss  Offline
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Pottstown, Pa
The original part number for the valve was 19131980 for the metal valve, long time not available. The new Delco number for the plastic valve is 155818 or 19193204. Of course most all these replacement parts today are shipped in from "other parts of the world", even the GM parts. Longevity isn't a consideration from parts suppliers today, it's price point.

Yes, there needs to be a seal at the heater core and evap openings in the suitcase to prevent air loss from the suitcase.

Hi Andy, good to see you still have the car.
Bob

#1050038 - 04/17/17 02:10 AM Re: Heater Control Valve [Re: jmireles]  
Joined: Dec 1999
Posts: 11,911
86ttop Offline
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86ttop  Offline
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Posts: 11,911
Brooksville, Fl
the air is blowing out because you left out that piece of sponge, it acted as an insulator and keeps heated/cooled air in the car and hot/cold atmospheric air out of the car/hvac system.


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1050073 - 04/17/17 07:00 PM Re: Heater Control Valve [Re: jmireles]  
Joined: Apr 2006
Posts: 254
Andy85SS Offline
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Andy85SS  Offline
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Milwaukee, WI
No luck at Autozone. Their heater valve (#5910) was a totally different design. Half metal, half plastic with an external dashpot. I passed. I'll probably just stay with the all plastic ones.

[Linked Image]

Hello to you too Bob! Life's been busy in other areas besides automotive the last few years, not so much time for Monte activity lately, but I still hope to have it till the day I expire!

However, I just replaced all the steering parts with Pro Forged stuff last week. She still rides great and drives even better now!

Peace!


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