Brrrr. - Heat Help
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New User
Joined: Jan 2003
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From: Custer, WA USA
Brrrr. - Heat Help
I thought this would be a simple problem, but the obvious doesn't appear to be the fix.
My 64' F100 is powered by a 69' 351w. It has been sitting for an extended period of time and after firing it up I seem to have a heater type of problem.
On a hour drive on the freeway it is only registering an engine temperature of about 160 degrees where I would think 180 degrees more appropriate. If I push it for a long period at about 75 mph it will hit 180 degrees. Problem is when I turn the fan on it doesn't kick any dash heat out. I replaced the thermostat thinking it was stuck but that didn't help. My heater core doesn't leak and is a pretty basic item. I can't think of any other potential problems. Any thoughts are appreciated. Other than running really cool it seems to run good.
Randy
My 64' F100 is powered by a 69' 351w. It has been sitting for an extended period of time and after firing it up I seem to have a heater type of problem.
On a hour drive on the freeway it is only registering an engine temperature of about 160 degrees where I would think 180 degrees more appropriate. If I push it for a long period at about 75 mph it will hit 180 degrees. Problem is when I turn the fan on it doesn't kick any dash heat out. I replaced the thermostat thinking it was stuck but that didn't help. My heater core doesn't leak and is a pretty basic item. I can't think of any other potential problems. Any thoughts are appreciated. Other than running really cool it seems to run good.
Randy
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Joined: Mar 2000
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From: Connecticut
Brrrr. - Heat Help
I would check 2 things. one, check to make sure your thermostat is not stuck open. If it's been in there a few years, replace it. They're cheap enough these days. Go with a 180 degree. Second, check to make sure the core is not plugged. Take both hoses off the engine and flush them in both directions. Also make sure the flapper doors are working properly. Have you got the hoses on the fittings going in the right direction?
Barry
Barry
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Joined: Jan 2003
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From: Custer, WA USA
Brrrr. - Heat Help
I replaced the thermostat and have since put about 150 miles on the engine, with most of the temp. at about 150-160 as mentioned above. The new thermostat does the same thing the old one did, acts like it is stuck open. Because it has been run that much, I would doubt that the engine is plugged up but I could be wrong.
Should I try replacing the thermostat yet again? Possibly got a bad one, or have any other thoughts?
Should I try replacing the thermostat yet again? Possibly got a bad one, or have any other thoughts?
Senior User
Joined: Mar 2002
Posts: 227
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From: Kent, WA
Brrrr. - Heat Help
Make sure that all of your heater controls are working properly (flappers, cables, etc...) Sounds like one of those is stuck closed, causing it not to blow any heat, or maybe a little bit.
Postmaster
Joined: Nov 2000
Posts: 2,557
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From: Texas
Brrrr. - Heat Help
Even if the engine runs at 160 degrees, you should feel heat in the cab. You may have air in the heater core and or your heater hoses are backwards. The heated water should flow from the manifold to the bottom bung and the top bung discharges into the water pump or directly into the radiator if its equipped with a fitting. Also check your valve on the passenger side fender skirt. If it's closed, water will not flow to the core.
I fixed afriends heater on his GMC once by removing the manifold connection and drilling out the clog of scale stuck in the orfice.
I fixed afriends heater on his GMC once by removing the manifold connection and drilling out the clog of scale stuck in the orfice.
