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Old 01-16-2006, 03:20 PM   #1 (permalink)
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heater ??

The heater in the chevy 4X4, 1981 has suddenly decided to stop blowing hot air. It will blow semi warm but will not ever get hot. First thought was maybe the thermostat, changed it out but that did not help. The water seems to be circulating ok through the radiator. I'm guessing the heater core is clogged up. WIth it hot and running the hose that comes from the connection on the top of the intake manifold is hot but the one that comes off of the water pump is cool/cold. I'm assuming that the water runs through the block and into the heater core through the hose coming off the intake manifold and then returns into the water pump, correct?
Any other thoughts or suggestions on possible soulutions. THis ()*(* always has to happen when it's 26 degrees and snowing
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Old 01-17-2006, 07:27 AM   #2 (permalink)
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Quote:
Originally Posted by Mike Catts
The water seems to be circulating ok through the radiator.
Actually, the purpose of the thermostat is to restrict flow until it warms up. Just had to replace the t-stat on my Saab. Old one was stuck open and things never warmed up. New one actually was faulty - ended up opening too soon and things never warmed up. Second new one worked like a charm.

Just something to check.
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Old 01-17-2006, 09:06 AM   #3 (permalink)
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Your assumption about the water flow is correct. If your hoses are warm then the hot water is getting to that point. I'd pull the hose that isn't warming up and see what kind of condition it's in. It could be old and collapsing, or you could have blockage at either end. Check the pipes out and see which end it's bad on and go from there. The water pumps like to corrode, so your heating issue may be a sign of an impending water pump failure as well.
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Old 01-17-2006, 09:36 AM   #4 (permalink)
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easy enough to swap the tstat
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Old 01-17-2006, 05:47 PM   #5 (permalink)
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I have put in a new thermostat and that did not solve the problem. I don't think that it is the water pump as I can leave the radiator open and watch for the water to start circulating after the vehicle warms up and the fact that the pump is only a few months old (replaced when I put a new motor in) I guess I'll pull the cool heater hose and see what happens then. I also picked up 2 of the inline heater hose cleanouts that you can hook a hose to. Will give a try to forcing water through the heater coil and see what happens then.
ANy other thoughts?
Thanks
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Old 01-18-2006, 09:00 AM   #6 (permalink)
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sorry. missed that in your first post.how hard to put a new core in?
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Old 01-18-2006, 06:36 PM   #7 (permalink)
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s1037s, not sure how hard it is to replace. As soon as I have some breathing room to spend a little time I'll let ya know. Judging by the book it does not look like just a whole lot of fun.
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Old 01-19-2006, 07:18 AM   #8 (permalink)
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i talked to two buddies last night and one said easy one said hard
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Old 01-19-2006, 09:45 AM   #9 (permalink)
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your cable broke that controls the flow valve. pull the glove box out and you will see the valve on top of the heater box. heater cores don't plugup quick its a long slow process.
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