Fan stays on full high even with ignition in off position.

1999 MERCEDES BENZ CLK320
150,000 MILES
Avatar
GRIFFIN
  • MEMBER
  • 1 POST
Must remove fuse to stop. can not turn down or off Air c. works great.
Apr 17, 2012 at 1:30 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
I was thinking the ignition switch may be bad, but if you have no control over the speed, it sounds more like a problem with switch. Check to see if the fan stops if you disconnect the switch. If it does, the problem is before the switch. If it doesn't, my guess is you have a ground to power after the switch itself.

Let me know what you find.
Apr 17, 2012 at 1:34 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.