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F 150 heaters just blow! Not much on line :(

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F 150 heaters just blow! Not much on line :(

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  #1  
Old 11-06-2017, 06:05 PM
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Join Date: Mar 2017
Posts: 20
F 150 heaters just blow! Not much on line :(

Mine is a '99. Yes the Radiator is good as is the thermostat. Yes the pump is good & the coolant full. The heater core is new & grounded to prevent electrolysis that those engineers cleverly engineered into the system. A number of google searches revealed little understanding in hundreds of posts over many web sites. The blend door??? Please. Not my first trip to the Rodeo.
Near as I can tell, cold air is being routed someplace to dilute the heat and unfortunately my Haynes book is a sad excuse of a guide. Seems like cables were proven technology but perhaps too reliable. Decent truck otherwise. (except for the Sun gears)
Who here really understand these systems.
 
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  #2  
Old 11-06-2017, 07:53 PM
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Join Date: Jan 2002
Location: Wilmington,NC
Posts: 4,144
Are both heater hoses hot to the touch?
 
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