Shut off valve for heater core? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cherokeejohn · 04-30-2016, 01:36 AM

I know I've seen a thread,or a post in a thread on a different subject on putting a shut off valve in the intake heater core hose. My truck has heat coming out of the vents even with the selector on the non-heat setting.I'm looking for info,pics, etc... on installing the valve,ie; size,style, metal/brass/plastic,fittings. If you have a link or info.on a thread with this info, please post it on here.

**Already Gone** · 04-30-2016, 02:34 AM

I'll get you pic of my setup in the morning.

**LockDoc** · 04-30-2016, 11:52 AM

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If you have heat coming out of your vents with the levers in the off position then there is either a blockage (think mouse nest) keeping the heat diverter door from closing or the rubber seal around it is bad. The valve may be a fix for your current problem but I would think you will have other problems with your heater/defroster when you do need them, unless you fix the diverter door.

LockDoc

cherokeejohn · 04-30-2016, 05:35 PM

I just replaced all the tubing, or hose, whatever its called back in fall. At the same time i cleaned the diverter box thoroughly.there was a large mouse or rat nest in there, and flushed the heater core also. The diverted box is broken at the bottom where the screws are and the rubber seal is , well non-existent. The defrost and heat work good, it's just now its coming into our warm season and i cant stand having heat blowing on me when its already hot outside. I lived in SouthWest Florida for almost 5 years, during that time I drove a GMC Sonoma,it was a decent little truck ex cab, 2wd 17" factory alum wheels, 4cyl, 5spd. the fuel mileage was great at 400-440 miles per tank. anyhow for 2 whole, HOT south Florida summers, i had to drive with the heat on to keep it from over-heating, all the while replacing parts of the cooling system 1 at a time. Turned out to be the fan clutch,after i had spent a grand on every other cooling system part i could replace. Sorry for the run-on here, point is, after that i have zero tolerance for heat blowing during summer months. I cant afford to replace the box at this moment, but it is on my list of purchases. I just want a cheap,temporary fix for the moment

Andy4639 · 04-30-2016, 05:38 PM

Here is one thread on this.
The system doesn't care where the valve is as long as you cut it off the flow through the heater is stopped and the heat can't get to the cab.

http://67-72chevytrucks.com/vboard/s...=296339&page=2

04-30-2016, 01:36 AM	#1
cherokeejohn Registered User Join Date: Aug 2013 Location: Wasteminster, Maryland Posts: 409	Shut off valve for heater core? I know I've seen a thread,or a post in a thread on a different subject on putting a shut off valve in the intake heater core hose. My truck has heat coming out of the vents even with the selector on the non-heat setting.I'm looking for info,pics, etc... on installing the valve,ie; size,style, metal/brass/plastic,fittings. If you have a link or info.on a thread with this info, please post it on here. __________________ 72 C/10, LWB, 5.7, Auto, with A/C F.B.I = Full Blood Indian Appalachia/Eastern Cherokee,"Tsalagi"

04-30-2016, 02:34 AM	#2
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,144	Re: Shut off valve for heater core? I'll get you pic of my setup in the morning. __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

04-30-2016, 11:52 AM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,818	Re: Shut off valve for heater core? - If you have heat coming out of your vents with the levers in the off position then there is either a blockage (think mouse nest) keeping the heat diverter door from closing or the rubber seal around it is bad. The valve may be a fix for your current problem but I would think you will have other problems with your heater/defroster when you do need them, unless you fix the diverter door. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

04-30-2016, 05:35 PM	#4
cherokeejohn Registered User Join Date: Aug 2013 Location: Wasteminster, Maryland Posts: 409	Re: Shut off valve for heater core? I just replaced all the tubing, or hose, whatever its called back in fall. At the same time i cleaned the diverter box thoroughly.there was a large mouse or rat nest in there, and flushed the heater core also. The diverted box is broken at the bottom where the screws are and the rubber seal is , well non-existent. The defrost and heat work good, it's just now its coming into our warm season and i cant stand having heat blowing on me when its already hot outside. I lived in SouthWest Florida for almost 5 years, during that time I drove a GMC Sonoma,it was a decent little truck ex cab, 2wd 17" factory alum wheels, 4cyl, 5spd. the fuel mileage was great at 400-440 miles per tank. anyhow for 2 whole, HOT south Florida summers, i had to drive with the heat on to keep it from over-heating, all the while replacing parts of the cooling system 1 at a time. Turned out to be the fan clutch,after i had spent a grand on every other cooling system part i could replace. Sorry for the run-on here, point is, after that i have zero tolerance for heat blowing during summer months. I cant afford to replace the box at this moment, but it is on my list of purchases. I just want a cheap,temporary fix for the moment __________________ 72 C/10, LWB, 5.7, Auto, with A/C F.B.I = Full Blood Indian Appalachia/Eastern Cherokee,"Tsalagi"

04-30-2016, 05:38 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Shut off valve for heater core? Here is one thread on this. The system doesn't care where the valve is as long as you cut it off the flow through the heater is stopped and the heat can't get to the cab. http://67-72chevytrucks.com/vboard/s...=296339&page=2 __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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