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Mike V.
Mike V., Automotive Technician
Category: Mercury
Satisfied Customers: 25318
Experience:  25 years experience witth all makes, Nissan and Subaru factory trained.
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Air conditioner/heating system. My 2001 Mercury Villager

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Air conditioner/heating system. My 2001 Mercury Villager system blow about 10-15 minutes then turns off. But the main problem is that it blow hot air when I turn on the air conditioner and blow cold hair when I turn on the heater. What is the problem?

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Does the engine temp gauge show a normal reading when this is happening?

Customer: replied 10 months ago.
the engine temp gauge show a normal reading when this is happening.

Ok, this is usually a result of a bad blend door motor/actuator. If it's not switching then you will continue to get cold air. You should see 2 small hoses going into the firewall, check and see if both are hot when the vans up to temp. If they are, then the heater core is good, but the actuator probably isn't shifting the door.

Check it out and let me know.

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