Sunday, November 18th, 2012 AT 6:04 AM
Cabin air doesn't work all the time. Usually when I start the truck it doesn't work at any speed and the speedometer needle drops to 0. Then for no apparent reason the blower kicks in at any speed and the speedometer needle works correctly. I've changed the blower resistor and the fan speed control. When I hook the blower directly to the battery the fan works fine. Any ideas would be appreciated.