ukr

First time ever the radiator fan was full on on cold engine. I shut the engine off and started it back on and it hasn't done this last few days. Car has 100k mil.

Any ideas what could be going bad?

stel_i79

Water pump going to fail;(

ukr

So if the water pump isn't working the radiator fan runs at full blast and no check engine light on a cold engine???

jtbgonesailing

Check for codes via the OBD2 connector. Use a scan tool that will pull BMW specific codes and the car will all but tell you what is wrong. These cares are driven by computers. My 05 has 35 modules talking to one another over bus bars.

ukr

Thanks!