heater blows cold air what can I check so it will work on 1997 Ford Expedition

I checked the vac. hose and its fine

by in Nottingham, MD on August 10, 2013
1 answer
ANSWER by on August 10, 2013
This is a blend door problem. This is above your ability. Seek out a repair shop for repair.
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So, here's what I've done: (1) checked coolant level, (2) confirmed blend door is working perfectly, (3) confirmed that both inlet/output tubes to the heater core on the firewall are hot, (4) torn ...

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