Question about 2003 Ford Crown Victoria
Look for missing, loose or dislodged vacuum hoses, the heater is designed to fail in the defrost mode.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.
Posted on May 23, 2009
if it switches function even only a few then the problem is not the vacuum source (if u had no vacuum it would default to defrost mode) the problem is the dash control head vacuum mode control switch, i don't think u can just replace the switch, u have to buy the whole climate control module.
Posted on May 21, 2009
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
Posted on Oct 06, 2009
It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars
Posted on May 23, 2010
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