Blower motor no high speed?

1997 CHEVROLET 1500
20,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
Avatar
RICHARD ROARK
  • MEMBER
  • 1 POST
Blower motor blows 50-amp maxi fuse when put on high speed even with the blower motor disconnected. Replaced relay and blower resistor and checked the blower motor with jumper to battery.
Aug 1, 2023 at 6:33 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,193 POSTS
  • ASE Certified Mechanic
Hi,

Does the fuse fail if you remove the relay? Power from the 50-amp fuse goes to the relay, but it isn't used until the relay primary circuit is completed. So, if it fails with the relay removed, the short is in the wire between the relay and the fuse.

I attached the wiring schematic below.

Let me know.

joe

See pics below. Note: I had to cut the schematic in half to make it readable for you. I did overlap the two so you can follow from one to the next.
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.
Aug 1, 2023 at 10:35 PM
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.