sounds like a bad blower motor resistor and or plug
The maximum towing capacity of the 2002 BMW 525i is 4,000 pounds. However, this vehicle is not recommended for towing.
Blower resistor is under Drivers' side of center console
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Behind the firewall on the back side of the engine.
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The type of coolant recommended for a 2003 BMW 525i is Glysantin G48. You can purchase this at an auto parts store or a BMW dealership.
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on a 2002 it in the trunck where the battery is located on the right hand side
Mounted on top and inside the fuel tank.