I got fooled by the "see through" coolant reservoir and the coolant level dropped low enough for the "Check Coolant Level" message to pop up on the On-Board Computer. I filled up the reservoir, checked it several times since then, started up the car, pushed the reset key on the OBC. I still ge the Check Coolant Level message when I start and when I stop. It clears itself after about 10 seconds after I start. I cant find any thing about how to clear it now that I have the proper coolant level. Any similar experiences? Thanks for the help.

Sounds like your coolant level sensor has gone south. It's a less than $20 part. The sensor is on the bottom of the expansion tank and to change it you'll have to drain the radiator. Before you go and spend money on the part, here's how to diagnose it first:

http://bimmer.roadfly.org/e36/messages/archive/msgsy2000w50/19810.html#followups

Good luck.

Thanks for the tip. I'll check it out tomorrow.