Defroster not working

1989 CHEVROLET VAN
125,000 MILES • V8 • 2WD
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ADDLEDDRAGON
  • MEMBER
  • 1 POST
There is no air coming through the defrost vents. The blower motor is working just fine, and i am able to regulate temperature. The air just comes out of the front vents, regardless of setting. Moving the vent position lever is smooth, no audible clicking or resistance of any kind. Can i get an HVAC system diagram? Where is the blend door located? Is there a diagram with the location of all of the solenoids involved in the HVAC system available?
Thank you.
Feb 22, 2019 at 10:26 PM
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SCGRANTURISMO
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 4,897 POSTS
Hello,

This could be a vacuum problem. In the diagrams below I have included a troubleshooting chart and vacuum diagrams for your vehicle. Go through them and let us know what you find out.

Thanks,
Alex
2CarPros
Feb 23, 2019 at 12:39 AM
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