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Feb 18, 2008 | 11:41 PM

fordlover1992

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Joined: Dec 2007

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heat

need to see if any one has any ideas . Have a 1992 f150 put a new thermostat in , flushed the cooling system , and put cardboard in front of the radiator still can't ge the truck to heat up.

Feb 19, 2008 | 01:07 AM

jeremiah302

Junior User

Joined: Feb 2008

Posts: 98

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From: Tennessee

what a coinsadense my is the doing this as well, i was told to check the trap door in the heater box under the dash, if it doesn't open it won't let in the hot air, i haven't done it yet b/c i have something more important to worry about on mine right now, but that is what i was told to do it is right behind the glove compartment. good luck

Feb 19, 2008 | 08:21 AM

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

Likes: 1,499

From: Ottawa, Ontario

First check that both coolant lines going to the heater core are hot when the motor is at operating temperature. If they are not disconnect them and flush the heater core with a garden hose, and then reconnect the hoses. If the hoses are hot remove the glovebox and then the core cover behind it and look for a foreign object jambing the diverter door or a broken vacuum line or cable from the heater controls.