1997 - 2003 F-150

heat

Old Jan 24, 2014 | 11:28 AM
  #1  
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heat

Installed new heater core 2yrs ago now i have heat at idle but blows cold air when I'm driving replaced thermostat 2 weeks ago and flushed heater core it has good flow
 
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Old Jan 24, 2014 | 11:52 AM
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glc
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From: Joplin MO
Check the little hard vacuum lines behind the battery. Make sure you don't have an airlock in the cooling system and the coolant level isn't low.
 
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