Ok so I have a 2002 clk320 140000 miles and the cooling fan for the engine stopped working so I test it direct power fan worked so I check all fuses look good can't find any prefuses so I changed the control module (Box under headlight on driver side) and still don't come on when it's hot comes on if the heater is on or ac Is on as long as ec is not on and I scaned it with a icarsoft mb 1.0 and nothing get link error on almost every option except ecm and that's if I go to w209 w208 gets link error and it says fan is 25% demand from ecm 0% demand from A/C 0% but if I turn off heater or A/C fan goes to 0 turn heater or A/C back on and fan starts again so I heard the the blower fan regulator is somehow connected to the auxiliary fan is that true please help thank you in advance

 

what about relays or control unit or a bad SAM---locate a wiring diagram the FUYAA wont work