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Heater blows cold air

(1999 Ford Explorer)
in Pelham, GA on March 17, 2011
Heater blows cold air and after 20 miles or so it will start getting warm. It then starts blowing cold again. It goes back and forth like this while running.
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Popular Answer
on March 18, 2011
Sounds like a classic thermostat issue.

However, if the engine is hot enough, it could be a temperature blend issue inside the dash.
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