Thanks for the tip - I'll get underneath this weekend and check that sensor. I'm going to do an oil change as well so I know what is in it.

This morning no puddles on the floor - so not sure what to think now. I'll have to watch the coolant and other fluids over the next few days.

Thanks everyone for the great advice. This is a wonderful forum with tons of information and DIY write-ups. My top bookmark for sure.

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2001 E53
Build Date 10/2000
4.4 sport package
Topaz Blue/Tan
150k on the clock and crossing my fingers
Grom USB Interface