whereis the thermostat located on 2005 BMW 325Ci

where is the thermostat located

Asked by for the 2005 BMW 325Ci
It's above the water pump, has a plastic housing. It's electrically controled, you have to replace the whole thing as an assembly (thermostat, housing and gasket).
You need to have some special tools to hold the water pump pulley while remove the fan clutch, otherwise you can damage few parts.
The use of the OE BMW coolant is extremely important! It has a blue color, don't use anything else. To bleed the system correctly is also an important thing, believe me, you don't want to overheat this engine.
If you are not very familiar with this type of engine and cooling system, better if you leave this job for a BMW specialty shop. If you want a good one in your area I can suggest one.

1 more answer
look at your motor and their will be 2 radiator hoses connected to the motor take them off and they should be between the motor and hose i had to replace one in my car and it was the top hose