Condenser fan speed control

2005 MERCEDES BENZ E320
256,000 MILES • 3.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
GORDON T RAMSAY
  • MEMBER
  • 3 POSTS
Fan runs at high speed continually. Always seemed to run at excessive speed when first started in hot weather, but now runs constantly fast.
Aug 10, 2016 at 6:37 AM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hey Gordon,

This is a common problem with these cars, the controller goes out and causes the fan to run continuously.

Here is a wiring diagram which shows the fan and controller are an integrated all in one unit.

Please let me know what you find

Best, Ken
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Aug 12, 2016 at 11:15 AM
Avatar
GORDON T RAMSAY
  • MEMBER
  • 3 POSTS
In that case I will listen to the noise. Rather than spend 500. Plus on a new fan assembly. Thanks for the prompt reply.
Aug 12, 2016 at 6:13 PM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Yep sometimes that is easier, please visit again when you have car troubles.

Best, Ken
Aug 13, 2016 at 4:51 PM
Avatar
GORDON T RAMSAY
  • MEMBER
  • 3 POSTS
Appreciate your help. Thanks
Aug 13, 2016 at 6:03 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.