No air from Defroster vent. – Gmc Jimmy 1989

Car Forum Repair & Maintenance No air from Defroster vent. – Gmc Jimmy 1989

  • Bham@98225kee
    Community Member
    November 28, 2021 at 7:09 pm

    I have a C3500 one ton and there is no air coming from the vent for the windshield.  All the other vents has lots of air coming out. The windshield fogs up. Any idea what is going on?

    Brand: Gmc
    Model: Jimmy
    Year: 1989

    November 29, 2021 at 10:20 pm

    The actuators on your car models should be powered by vacuum if I remember right. Therefore it could be a vacuum leak from the hoses to the actuator. Another possible cause is the switch itself or something wrong with the actuator flap. I would check the vacuum hose for any leaks on the vacuum system.