This is common problem. You need new resistor to your fan, cheap and easy. See for example bmwfans.com
SOURCE: I have a coolant leak on my 2000 BMW 528i and now it overheating.
Pressure test cooling system to determine origin of leak. Radiator and coolant reservoirs are common problems. Vehicle is very difficult to purge air from cooling system and may take multiple times of idling until thermostat opens. Sometimes help to rev engine to about 2500 rpm 5-8 times to help build heat and move coolant through system. Must have heater on while performing this task.
SOURCE: 2000 bmw 528i overheating
The only way a heater core can cause overheating is if it's leaking and the engine is low on antifreeze. To check it for leaks it would help to use a cooling system pressure tester.
SOURCE: 100000 mile service checks/replacement parts on a 2000 BMW 528i
If your talking about what would a dealership change, it generally consists of a tune up, including spark plugs, plug wires, air filter, oil change, pcv valve, and fuel filter. Thats also usually when they want to replace the timing belts. There may be one or two other things specific to BMW, but generally thats what you can expect.
SOURCE: Heater/AC fan motor keeps running after car is shut off
that's normal when hot, but should't run down the battery. if severly overheats ffnd/fix that problem. the other will probably dissapear . if not excessively hot then the fan heat sensor is faulty....
SOURCE: put in a new wiper motor 1997 e39 528i bmw\it stops in the middle
Remove arm(s), put wiper motor in park,(shut off) then re-install arm at base of windshield where they were before,when shut off.(in park position.)
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