Heater always seems to blow out vents - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hummbusa · 04-03-2015, 11:17 AM

I have been slowly working my way through my truck and keeping it on the road at the same time. Anyways I replaced the heater core earlier this year and could keep my cab plenty warm...now that it is warming up even when the heater knob is turned all the way to what should be the off position it still blows. I can turn it right 3 clicks but the last click kicks it to high I can tell that. Also in the manual it says to pull out the knob for heat. It seems to make no difference if knob is out or in? Any suggestions? Thanks

**PGSigns** · 04-03-2015, 11:51 AM

You will get some flow through when moving down the road, mine does it. What I had to do was install a heater control valve to stop the hot water. I dont get a lot of air while running down the road but I do get some.
Jimmy

nail pounder · 04-03-2015, 12:02 PM

Same on my 66, even with the knob pushed in. I keep foot vents open & windows down when I'm cruzin..& blast some Waylon.

04-03-2015, 11:17 AM	#1
Hummbusa Registered User Join Date: Aug 2004 Location: iowa Posts: 56	Heater always seems to blow out vents I have been slowly working my way through my truck and keeping it on the road at the same time. Anyways I replaced the heater core earlier this year and could keep my cab plenty warm...now that it is warming up even when the heater knob is turned all the way to what should be the off position it still blows. I can turn it right 3 clicks but the last click kicks it to high I can tell that. Also in the manual it says to pull out the knob for heat. It seems to make no difference if knob is out or in? Any suggestions? Thanks __________________ 1972 SWB C-10 383 stroker 200r4 tranny(sold) but looking for another 1965 SWB C-10 satin black V8 turbo 350 Central Iowa

04-03-2015, 11:51 AM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Heater always seems to blow out vents You will get some flow through when moving down the road, mine does it. What I had to do was install a heater control valve to stop the hot water. I dont get a lot of air while running down the road but I do get some. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

04-03-2015, 12:02 PM	#3
nail pounder Registered User Join Date: Aug 2014 Location: Fallbrook CA Posts: 453	Re: Heater always seems to blow out vents Same on my 66, even with the knob pushed in. I keep foot vents open & windows down when I'm cruzin..& blast some Waylon.



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