Heater fan

1995 BUICK PARK AVENUE
270,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
Avatar
GDADKINS
  • MEMBER
  • 1 POST
The heater fan will occasionally turn on with ignition switch in off position running the battery dead. Sometimes the fan will keep running when the ignition switch is turned off.
May 2, 2020 at 1:50 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good evening,

The most common cause for this issue is the blower motor resistor. It shorts to power and the blower will not stop running, even with the key off.

I attached the location and procedure for you along with a wiring diagram.

Roy
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.
May 2, 2020 at 3:31 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.