Found it! Aux Fan Relay!!!

Back on December 19th I came out of the hotel to go take a test and found the battery dead on the car. When I jumped it off to get it started the aux fan started running as soon as the cables were hooked on. By the time I got home that night the fan was not doing that any more.

This spring the ground came in, or at least I noticed it finally.

Once the weather warmed up I noticed that I was having temperature problems.

In April I bought a truck and started driving it every day. I forgot about the car for a while.

Yesterday I was filling out some paperwork and had to look up the day that I took a test, the day the fan ran all night and killed the battery. It all came rushing back...fan running on its own...fan fixes itself...temperature problems...ground... A coil on the Aux Fan Relay shorted itself to ground!!!

.01 amp draw with the engine off and the Aux Fan Relay removed! Life is good!!!

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.