My wifes ml320 check eng. light came on and comp. says its aux. fan problem.checked 44 fuse-good.fans don't turn when engine gets hot or when ac is on!Swaped relays in fuse box-nothing.Pulled plug at fans,checked voltage-nothing.Fans turn freely by hand.Is there some kind of senser that turns on the aux.fans and could that be my problem?Trying to get car inspected but can't because of check eng. light!!!
Thanks for any help!!!!