Hi folks, about to change my X5's water pump & thermostat. I have seen a few video & DIY posting on how to do this and feel confident I can do this. I purchased the thermostat from my BMW dealer this morning and when I opened the box there is a bolt, threaded on one end and has no head but what looks like a hole at the other end that fits a allen wrench. Does anyone that has done this know what this is for? None of the stuff I have seen shows replacing a bolt like this one. Is not a mouting bolt because it does not fit any of the mounting hole threads.
Thanks