Heat issue
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New User
Joined: Nov 2011
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Heat issue
After installing a re-built 390 in my 73 F-250 and running it for a week or so now I still can't get any heat out of it. It doesn't seem to have any hot water going through the heater core whatsoever. The radiator is new and full, heater core is new, thermostat is new. The heater hoses are hot to a certain point and then not really very warm as you move up towards the firewall. Is this thing air-bound or something? I don't understand how it can't be moving water through the heater core. Help !!
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,247
Likes: 5,815
From: S/W Missouri, Polk county
Park your truck on a tail low place or put the front end up on some metal car ramps. Get the front end up higher that the back and open the radiator (take the cap off) start it, let it idle till the thermostate opens and it should burp the air.
Did you put the wrong intake manifold gasket on and cut off a water port? I'm am spit balling that idea. Sure the water pump is good?
Clogged heater hose lines?? Did you get the block flushed out during the rebuild? Thermostat is for sure the correct one and installed correctily, it happens.
Did you put the wrong intake manifold gasket on and cut off a water port? I'm am spit balling that idea. Sure the water pump is good?
Clogged heater hose lines?? Did you get the block flushed out during the rebuild? Thermostat is for sure the correct one and installed correctily, it happens.
Elder User
Joined: Apr 2008
Posts: 542
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From: Dixon, IL
if they are warm by the engine, and cooler and the firewall, sounds like something isn't flowing.
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Does this truck have any sort of vacuum-operated shutoff valve in the heater core supply line? I agree with the advice to try flushing the core. In your first post you said the heater core is new; in your second post you said it's 4 years old. That's not new.
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Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
Agreed, usually we're left hanging after giving advice. Thanks for updating us and congrats on fixing the problem.
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Rob Cuenin
1973 - 1979 F-100 & Larger F-Series Trucks
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Mar 10, 2013 11:47 AM