Question about 2004 Ford Crown Victoria
Controller runs on vacuum. You have a vacuum leak between the engine intake and the HVAC control switch or in the switch itself. First look for the vacuum source and hose in the engine compartment. if that is OK, open the dash to access the back of the climate control switch. Disconnect the hose set from the switch and check for vacuum on one of the lines--that would be your source vacuum. The switch will pass vacuum to different remote diaphrams to switch the doors in the system to deliver air to the various registers. If the switch is falling apart and leaking vacuum, you will need a new one.
Posted on Aug 23, 2010
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Posted on Jan 02, 2017
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