Where is the thermostat on a BMW 325?
What is the year? If it's an e36, its where the two radiator hoses
meet in front of the engine above the belts.
My car is a 2002 325 i, e46 model. 90k miles and never
overheated. Read below.
here is something else i am looking at on mine. I replaced the
coolant reservoir yesterday, but after taking the old one off the
car, realized that there is some small enclosed thermostat located
under the reservoir. The new reservoir slides down onto the hoses
and junctions, and into this bottom hose there is an enclosed and
very small looking apparatus. Measuring about 1/2 inch across and
about the same in height, and sitting on a spring, the one in my
car was sitting crooked, and this resulted in the new reservoir not
seating properly and fully down on the connections and hoses.
Inspecting it showed that it should be fully upright and let the
reservoir seat down on it. A VERY tight fit. Attempting to
straighten mine out, and being gentle, it cracked and came apart in
Now I am screwed, as NO ONE has ever mentioned this particular
part in any discussion that I have found. What exactly is it, and
how important is it?