Having overheating episodes on my 2001 bmw525i

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It looks like your water pump on a 3.5L is run off the timing chain. I got some info which may help see it but may not be the exact as your car. If you are having some problems with overheating from what I saw looks like you have 2 thermostats and after changing thermostats, you can have air trapped in your engine, which will still allow engine to overheat.

Take out the starter it might b defective take it back and exchange it then try it Agian

IS THERE A LEAK?IS THE CORRECT THERMOSTAT INSTALLED?IS THE HYDRLAULIC FAN REVING MORE WHEN IT HEATS UP?IF U START THE AC THE ELECTRIC FAN GOES ON?DOES THE TEMP FALLS?ARE ALL THE WATER COLARS WARM?LET ME KNOW

The brake light switch connected to the brake pedal.

Hi, you mentioned a clutch fan? I belive they have an elec. Fan. Have that checked.

Well it sounds like you have covered most of the bases.
One thing that could cause overheating is a restriction in the exhaust.
Do you know if the radiator fan is coming on when the engine reaches 220 degrees ?
How long can you drive it before it starts overheating, and does it boil over when it does ?

which motor does it have in it... if it has a 3.8 it probably has blown head gaskets and once you overheat that motor it warps the block and well its done.. even rebuilding it doesn't work..

use starting fluid to start if it does you have fuel problem if it doesn`t chack spark or timeing good luck

It is very unlikely that the transmission would over heat enough to cause a fire anywhere in the passenger compartment. If in fact there was a fire in the passenger quarter panel area there are two things that would be the cause. Either wiring behind the kick panel became shorted and caused the fire or the exhaust became extremely overheated and caused the fire.

Next time it is too hot to start take off the fuel cap and give it a try if this alows the vehicle to start check with your local dealership repair center on how to deal with vapor lock .