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Old 10-08-2012, 11:03 AM   #1
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Default Do I have a warped head or bad head gasket?

97 f150 5.4 have been having heater issues. Ive changed thermostat, flushed heater core, and radiator checked blend doors, and everything works as it should. Truck just doesnt put out much heat. Ive burped the system several times so i know theres no air in it either. When u first start the truck it goes give a small amount of white smoke but it doesnt stink any. No signs of coolant on oil dipstick and i never have to add antifreeze to it? System just acts like theres a problem somewhere not allowing it to build up any pressure! When the truck is at operating temp the upper radiator hose doesnt hardly carry any pressure at all? Im new to fords and im running out of things to look at or check any help is appreciated!!!!!!!! Thanks
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Old 10-08-2012, 11:58 AM   #2
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Have you changed the hoses? Degas chamber cap? There are alot of things that could cause it. Even a broken blend door motor.
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Old 10-08-2012, 12:05 PM   #3
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The puke tank cap could cause lack of pressure???
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Old 10-08-2012, 12:06 PM   #4
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Yes. If its not sealed it will never create pressure.
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Old 10-08-2012, 12:16 PM   #5
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Ill pick one up tonight and see if that helps any. Could it also cause the lack of heat not getting very hot?
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Old 10-08-2012, 12:17 PM   #6
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No. Even if the system was open the truck would still get to operating temperature. Are you sure that the T-stat has not failed?
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Old 10-08-2012, 12:21 PM   #7
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I just changed the tstat 2 weeks ago
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Old 10-08-2012, 12:48 PM   #8
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It still could have failed and failed open. What brand did you buy?
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Old 10-08-2012, 01:09 PM   #9
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Its a duralast from autozone
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Old 10-08-2012, 01:10 PM   #10
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Take it back. Get a Stant or OE motorcraft. I have seen them fail open and closed before. They are cheap for a reason.
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Old 10-08-2012, 01:10 PM
 
 
 
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