Defroster not working

1989 CHEVROLET VAN
125,000 MILES • V8 • 2WD
Avatar
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
Advertisement
Avatar
SCGRANTURISMO
  • ✓ASE Certified Mechanic
  • 4,897 POSTS
  • ASE Certified Mechanic
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
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Feb 23, 2019 at 12:39 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.