The new fans used on the M272 and M273 engines can be very loud. The one on my CLK sounds like a civil defense siren when it winds up. The control is smart - when the A/C system demands max cold, it will run the fan at full speed. It also runs at full speed when engine temp begins to climb and ambient temp is high. For example, in cooler ambient temps, my engine temp can climb above 90C and the fan just barely runs, but when it's 90F outside, the fan comes on full blast when the engine temp edges over 85C.
Loud radiator fan
I have a 2005 C230. About 30 secs after it starts until about 30 secs after it is turned off it sounds like a jet engine is in there.
It doesn't matter if it is cold or warm when it starts, or if the a/c is on or off. I have located the problem, which is the radiator fan. I have gone through the forums and tried a few things offered. The things I have tried are as follows:
reset the a/c by pushing the defrost and recirc air buttons until the led light quits blinking
moved the fan itself to see if it was stuck, which it wasn't, it turned easily
jiggled the fan back and forth to see if it was loose, it was on correctly
tapped the relay with a screwdriver while the car was running to see if it would adjust, didn't work
changed out the fuse, still didn't change anything
I amabout to pull out my hair, please help
It doesn't matter if it is cold or warm when it starts, or if the a/c is on or off. I have located the problem, which is the radiator fan. I have gone through the forums and tried a few things offered. The things I have tried are as follows:
reset the a/c by pushing the defrost and recirc air buttons until the led light quits blinking
moved the fan itself to see if it was stuck, which it wasn't, it turned easily
jiggled the fan back and forth to see if it was loose, it was on correctly
tapped the relay with a screwdriver while the car was running to see if it would adjust, didn't work
changed out the fuse, still didn't change anything
I amabout to pull out my hair, please help
1 - 3 of 9 Posts
This means that it is not getting a signal from the ECU. If the engine starts and runs normally, then it could be a bad temperature sensor, a bad fan control unit (built into the fan) or a wiring issue. You need to get a proper diagnosis bu pulling codes.
1 - 3 of 9 Posts
Mercedes-Benz Forum
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!
Full Forum Listing
Recommended Communities
