everything you need to know.....http://www.bimmerfest.com/forums/showthread.php? t=713745
Go through the usual suspects... thermostat, water pump, radiator, fan, etc... The link Tom posted is will actually apply to most BMWs! Great information there!
The three main culprits in the 8 series are: (1) cracked radiator overflow unit (2) cracked or blocked up radiator and (3) the valley pan gasket in the engine. Symptoms of #3 include loss of coolant in full tank. Antifreeze smell when driving or at shutoff; gauge goes beyond midpoint after warmup.
Once I start it up and let it run for a while it just start running hot and give a burnt smell.
Thermostat is probably shot. Is the fan coming on?
I had it to the shop they took the thermostat out . But it still run hot very fast
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