ive checked fuses , i cant find any wireing diagrams so i can trace down the problem, dont know what relay to check, any help would be great. i know my way around cars and wireing but i dont have any way to get the diagrams so what should i try.
my fans and heater arnt working at all on 2003 BMW 530i
Your right to attack the problem by looking at a wiring diagram first.There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
This problem needs to be diagnosed correctly by a professional in your area. One common problem is the heater fan motor resister module. I would still recommend having the problem diagnosed before blindly replacing parts. If you still want the wiring diagram there are web sites that can provide you with that information for a small fee.