Hi all--our '97 Dodge 170P has a glitch. Crazy weather here in the Pocono Mts. of Penna. has us using both the heat and the AC at times. Unit has started sending all output through the defroster ve...
Had the same thing happen on my 93 Dodge. Turned out to be my Sirius radio receiver that was installed behind the regular radio had shifted and crimped the vacuum line to an actuator. That vacuum actuator is located just behind the radio and I removed the radio to see it.