On the e39's the heated mirrors, washer nozzles, & door lock came on @ 45degrees F.

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'08 Honda Accord LX
4cyl 5spd man Taffeta White still stock
'06 Solar Yellow Nissan Xterra-S
4x4 6spd manual 20% tint Sirius InV
'98 BMW 528i RIP 3/98-12/31/08 180,000 miles