[lincolnmaster80]

Originally Posted by lincolnmaster80

The expansion tank is removable. There should be one nut type jobbie on either side (part #4)
http://bmwfans.info/parts/catalog/E3...xpansion_tank/

This might be the culprit right here:


Remove the expansion tank and have a poke around:
http://www.bimmerboard.com/forums/posts/415525

The temp guage going hot is probably do to air lock and low coolant.

It's worth mentioning that the T-joint on part #12 where it leads up to the expansion tank is a known problem area. If there isn't any coolant leaking inside the cabin when you refill the expansion tank, then your problem isn't inside the car...