Mechanics

, THE HEATER IS BLOWING COLD AIR. WHAT MIGHT BE CAUSING THIS PROBLEM?

1999 Ford Expedition • 15,000 miles

When is heater **** is all the way to heat with high fan it blows cold air.
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RJSTES
December 19, 2011.



The first thing I would do is make sure both your heater hoses going into the heater core are getting really hot when the engine is up to normal operating temp.

Saturntech9
Dec 19, 2011.