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Old 12-03-2009, 12:57 AM   #1
im tha best
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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.
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Old 12-03-2009, 01:14 AM   #2
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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
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Old 12-03-2009, 01:16 AM   #3
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Re: heater isnt heating anything

thanks dude!
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Old 12-03-2009, 10:47 AM   #4
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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.
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Old 12-03-2009, 11:38 AM   #5
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Re: heater isnt heating anything

taking heater core out and clearing out 40years of crap out of the housing makes a big difference
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Old 12-03-2009, 11:46 AM   #6
cedorris
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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.
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Old 12-03-2009, 12:32 PM   #7
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Re: heater isnt heating anything

It may sound simple, but have you checked that you have sufficient fluid in the cooling system?
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Old 12-03-2009, 12:50 PM   #8
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Re: heater isnt heating anything

Also check your themostat. It may be bad and stuck in the open position.
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Old 12-03-2009, 03:16 PM   #9
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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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