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Posted: Tue Apr 05, 2005 10:48 pm Post subject: so heres the problem, my heater wont turn off.
when ever i am driving i can feel heat coming from either the floor vents or the defroster vents.....and the fan isnt running.....and i can hear a hissing noise coming from the heater. it hasnt always been doing this, it just started this winter.
if anyone could help that would be awesome. cuz summer is coming. _________________ 84 GMC Caballero
Necoa #: 4629
Location: 13(TX)
Joined: Jan 09, 2005
Posts: 48
Year: 1979
Model: El Camino
Posted: Fri Apr 08, 2005 9:39 pm Post subject:
Hot water circulates through the heater core all the time on some models, others have a vacuum operated water flow valve in the engine compartment. Another vacuum operated diverter causes air to either pass thru the heater core to the passenger compartment or blocks the airflow. Sounds like you may have a problem with the diverter actuator or the vacuum line from the heater control lever assembly to the actuator, or perhaps a bad valve on the dash mounted lever assembly. This leak will be the source of the hiss. It's not too hard to get in there and check the system out - but do it before it's 100 degrees in the garage!
Necoa #: 2321
Location: 15(AZ,NM)
Joined: Jan 30, 2004
Posts: 1169
Year: 1974
Model: El Camino
Posted: Fri Apr 15, 2005 12:07 am Post subject:
I still have the vacuum operated valve on my 74. It's a kind of L shaped tube with a small vaccum line running to a disk shaped vacuum housing. One side of it is a tube that runs up to the vacuum disk and then there's a tube that comes out of the center of the vacuum disk that hooks to my heater hose that goes back to the firewall where my heater core hooks up.
The other kind of setup is likely on the back of your AC slider assembly. Buried within the bundle of vacuum hoses that plug into that slider will be one vacuum line that goes to a diaphram cannister that contols the opening and closing of the door that sits in front of the heater core located inside the ductwork on the firewall.
Just a shot here but I know for sure about the one on the intake manifold.
_________________ 74 El Camino Classic - project car #1
96 Camaro - RIP, Traded 10-16-2007
2008 Mustang GT, It ain't a Chevy but at least it's American!
just out of curiosity....is there like an "easy fix" like until i have time to work on it....like is there anyway, i can stop heat from entering the cabin? cuz i hate not being able to control the tempreture in my car.....and it sucks cuz my a/c went out last year....so i can't cool it down...but yeah....if u know of anything else that would be amazing
just out of curiosity....is there like an "easy fix" like until i have time to work on it....like is there anyway, i can stop heat from entering the cabin? cuz i hate not being able to control the tempreture in my car.....and it sucks cuz my a/c went out last year....so i can't cool it down...but yeah....if u know of anything else that would be amazing
thanx, you're awesome....
Alex
Pinch off one of the heater hoses to prevent hot water from entering the heater core. _________________ El Camino Central Founder/AdministratorAuto A/C & Electrical Shop Owner, ASE Master
heck just take the heater box out of the loop. Drain system, disconect both heater hoses then cut yourself a 12 to 14 inch bypass and hook that up to water pump / manifold outlets _________________ Chillin in Lauderdale
heck just take the heater box out of the loop. Drain system, disconect both heater hoses then cut yourself a 12 to 14 inch bypass and hook that up to water pump / manifold outlets
that sounds like a RAD idea, but won't it be a big pain in the rear end to put back in when winter comes back around? _________________ 84 GMC Caballero
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