Can anyone help please I’ve just replaced the thermostat on my 1999 328 m52 engine and it’s seems to not be cooling down this was the thermostat that I took off it has nothing inside is there a reason why?......When I got the car the fan was broke and someone had cut all the wires well I can’t find any anyway. so I put a electric fan on a switch that’s when I noticed the thermostat wasn’t working the car temp would just keep dropping but now I have the new one in it got to 92 I put my fan on and it just kept going up? Any help appreciated 

Morning Jack

Welcome to the Forum

That looks like the Thermostat housing alright Is, was the thermostat still stuck in the head? 

If not then someone has had an issue and rather than replace it has binned it ?? Helpful !! not. If you are not aware www.realoem.com is a BMW online parts list put the last 7 digits of your Vin into the search box and it will bring up your model. There are small exploded drawings which may be some help plus you will have correct part numbers for ordering. Another site that may help is www.pelicanparts.com great how to's with pictures.

If my old brain hasn't failed me there is also a temperature sensor in the bottom hose. You could possibly tap into that to control your fan. Check fan rotation just in case your fan is pushing hot air from the engine onto the rad not pulling cool air through.

Hope this is some help

Dave

 

2 hours ago, Greydog said:

If my old brain hasn't failed me there is also a temperature sensor in the bottom hose. You could possibly tap into that to control your fan. Check fan rotation just in case your fan is pushing hot air from the engine onto the rad not pulling cool air through.

Very good point Dave....that would definitely explain it.

Also, think there is a bleed point (bolt) on the water pump to bleed the air out?