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View Full Version : I have a 2002 Ford Expedition. The heater blows cold air when the engine speed slows


wcol37836
Nov 5, 2011, 01:20 PM
I've already changed out the thermostat. Any other suggestions or ideas are appreciated.

Thanks

0rphan
Nov 5, 2011, 02:07 PM
Could it be the coolant system?

Flush coolant system,

Flush heater core and pull off heater core hoses( if you can get to them )and make sure that they are not clogged.