heater isnt heating anything - The 1947 - Present Chevrolet & GMC Truck Message Board Network

im tha best · 12-03-2009, 12:57 AM

My heater is blowing colder air than my moms new car AC. how do i fix it? its not fun when its 33 outside and you cant hardly turn the wheel cause your hands are frozen.

kevmic28 · 12-03-2009, 01:14 AM

Somebody just posted on here earlier about the same thing. Lots of ideas on that thread. Check here:
http://67-72chevytrucks.com/vboard/s...d.php?t=374706

im tha best · 12-03-2009, 01:16 AM

thanks dude!

kevmic28 · 12-03-2009, 10:47 AM

Hey a quick fix would be to run by Northern Tools and pick up a small heater that plugs into the lighter. Not real warm but at least you wont freeze.

cdowns · 12-03-2009, 11:38 AM

taking heater core out and clearing out 40years of crap out of the housing makes a big difference

cedorris · 12-03-2009, 11:46 AM

Have fun taking that heater core out dude

It's not hard, but it is a lot of work. The good news is that new ones are fairly inexpensive.

northerngmc · 12-03-2009, 12:32 PM

It may sound simple, but have you checked that you have sufficient fluid in the cooling system?

kevmic28 · 12-03-2009, 12:50 PM

Also check your themostat. It may be bad and stuck in the open position.

69GMCLonghorn · 12-03-2009, 03:16 PM

Luckily, the heater systems are not overly complicated on these trucks so it can only be a handful of things causing the no-heat-freezin'-your-n*ts-off syndrome. I spent one day going through mine a few years ago and had PLENTY of heat, even when it was 30 something outside (yes, it gets down there in the SF valley a couple times a year!).

Check that the barn doors are actually opening and closing by moving the butterfly valves, not the cables.

Clean the crap out of the heater box and make sure that leaves are plugging up the air flow.

Is the fan coming on? If not, check the motor, connections, fuse, etc...

There shouldn't be a heater control valve in the cooling system (assuming it's non-A/C), but if someone snuck one in, that might be an issue as well.

12-03-2009, 12:57 AM	#1
im tha best Registered User Join Date: May 2009 Location: Irving, Texas Posts: 68	heater isnt heating anything My heater is blowing colder air than my moms new car AC. how do i fix it? its not fun when its 33 outside and you cant hardly turn the wheel cause your hands are frozen. __________________ 68 Chevy C10 long box

12-03-2009, 01:14 AM	#2
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Re: heater isnt heating anything Somebody just posted on here earlier about the same thing. Lots of ideas on that thread. Check here: http://67-72chevytrucks.com/vboard/s...d.php?t=374706 __________________ 1970 GMC truck 1988 Harley 1200 Sportster

12-03-2009, 01:16 AM	#3
im tha best Registered User Join Date: May 2009 Location: Irving, Texas Posts: 68	Re: heater isnt heating anything thanks dude! __________________ 68 Chevy C10 long box

12-03-2009, 10:47 AM	#4
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Re: heater isnt heating anything Hey a quick fix would be to run by Northern Tools and pick up a small heater that plugs into the lighter. Not real warm but at least you wont freeze. __________________ 1970 GMC truck 1988 Harley 1200 Sportster

12-03-2009, 11:38 AM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: heater isnt heating anything taking heater core out and clearing out 40years of crap out of the housing makes a big difference __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-03-2009, 11:46 AM	#6
cedorris 1972 Chevy Cheyenne Super Join Date: Feb 2009 Location: Oklahoma City, OK Posts: 302	Re: heater isnt heating anything Have fun taking that heater core out dude It's not hard, but it is a lot of work. The good news is that new ones are fairly inexpensive. __________________ -Clayton 1972 Cheyenne Super LWB 350 - farm truck restore project - twitter @oldgreen

12-03-2009, 12:32 PM	#7
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: heater isnt heating anything It may sound simple, but have you checked that you have sufficient fluid in the cooling system? __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!

12-03-2009, 12:50 PM	#8
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Re: heater isnt heating anything Also check your themostat. It may be bad and stuck in the open position. __________________ 1970 GMC truck 1988 Harley 1200 Sportster

12-03-2009, 03:16 PM	#9
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: heater isnt heating anything Luckily, the heater systems are not overly complicated on these trucks so it can only be a handful of things causing the no-heat-freezin'-your-n*ts-off syndrome. I spent one day going through mine a few years ago and had PLENTY of heat, even when it was 30 something outside (yes, it gets down there in the SF valley a couple times a year!). Check that the barn doors are actually opening and closing by moving the butterfly valves, not the cables. Clean the crap out of the heater box and make sure that leaves are plugging up the air flow. Is the fan coming on? If not, check the motor, connections, fuse, etc... There shouldn't be a heater control valve in the cooling system (assuming it's non-A/C), but if someone snuck one in, that might be an issue as well.

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