Actually, I did let it idle for several minutes.

The car has been through seven New England winters with me and this behavior was unique. It wasn't the kind of slowness that one would typically associated with a cold engine. I've been driving OM602 cars since 2003 so am pretty familiar with how they respond to the cold.

Block heater has never worked.

Let it sit for four hours then drove ten miles. Everything working perfectly...including the horn. Weird.

It will be -7 tomorrow morning...we'll see what happens.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife