motoadve

Took the car for a check because was loosing power and getting flodded.
They cleaned injectors and reset the throttle.

But they say the fan is running at full all the time.So its a faulty fan control unit.
So I go and buy a unit, now the fault persist, they say is the main computer and they will try to reset it, and if it doesnt work, I need to buy a new computer.

This is in Costa Rica by the way.

Any advice or ideas?

tanktube67

did you took it to MB dealer?

motoadve

Yes its the dealer
Has been there for 2 weeks

06c230hwd

What year w203 is this? and is it a w203? :P

motoadve

C320 year 2002 35,000 miles

06c230hwd

Have you not spoke with them since they tried to reset your ECU? Maybe resetting the comp. is all they need to do hopefully.. besides that there should be some sort of relay in the circuit to allow the fan to switch between two different voltages. (The higher the voltage, the faster the fan). So anyways, maybe your relay is busted!? Don't know for sure man..

motoadve

They say they did reste the ECU and no luck!!
Tehy want me to buy a new ECU $3,500

Im taking my car out and will use it with the fan running at full.
I dont think it will damage the car right?

Buellwinkle

Wow, even in Costa Rica, dealers will steal from you. First off, I seriously doubt the ECU controls the fan. The way these fans work on MB's is go full out when grounded, so it's possible you have a short in the fan somewhere. Also, there could be a ground somewhere between the fan, the control unit and the switch which can also be bad. I don't know what module controls the fan but if I had to guess it would be the SAM modules, not the ECU. Also, in the U.S., the ECU is about $1,500 but dealers charge about $2,000 which is in itself outragous but it's very rare that these go bad but it's not rare that dealers misdiagnose a problem solely for the sake of higher revenue.