Heater blows cold air on 2003 Ford Focus

My heater use to blow cold air just when I was stopped at stop lights, or just idling. Now, it blows cold air all the time. I took it to a mechanic, but they "could not duplicate problem." What could it be?

by in Grand Junction, CO on February 21, 2009
2 answers
ANSWER by on February 22, 2009
Try filling out this diagnostic sheet next time you take the car in to the shop, it may help the mechanic find the problem. http://repairpal.com/blog/Heating-And-Cooling-Issues
ANSWER by on November 28, 2010
Open Hood and check for Vaccum leaks.
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