Question about 2008 Ford F 250 Super Duty 4WD

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I have a 2008 F-250 when the heater is on and the truck is stopped or driving under 15 MPH the heater blows cold air, if you speed up it starts blowing hot again. What could this be?

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Could be low coolant, could be a bad head gasket or other point where combustion gasses are entering coolant.

The heater core fills with bubbles, it's commonly the highest point in the cooling system. When the motor is turning slow the water pump isn't moving enough water to force the bubbles to go on through the heater core but when you speed the motor up the pump is able to force the bubbles down to the motor. They'll go to the top radiator tank and then out the pressure cap to the recovery tank. Look for bubbling in the coolant recovery tank.

lp

Posted on Dec 29, 2010

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