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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

Heater ?

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Old Nov 17, 2007 | 11:47 AM
  #1  
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Heater ?

Truck is fully warmed up. Temp dialed all the way to red.Heat blows hot in defrost, floor or dash vents when moving.Stop at light or sign, and it blows cold. Any ideas
 
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Old Nov 17, 2007 | 11:52 AM
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low coolant
 
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Old Nov 17, 2007 | 02:57 PM
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The heater core could be partially plugged (unlikely) or the vacuum controlled heater valve could be defective.
 
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Old Nov 17, 2007 | 05:10 PM
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My guess is vacuum leak, perhaps pump or hoses.
 
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Old Nov 17, 2007 | 08:32 PM
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There's a TSB about the vacuum pumps flaking out on some trucks. Hopefully it's just a leak like barnbridge said, but if not you may need a new vacuum pump.
 
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Old Nov 17, 2007 | 09:45 PM
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Coolant was low. Heat is good,thanks
 
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