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1. Is the fogging of the rear plastic window a serious problem in cold weather?
-- no --
2. Are all Boxsters "pre-wired" for the hardtop?
-- Probably, my Boxster came with the side window defrosters, which share the dash switch with the hardtop pre-wire. Not all Boxsters have heater mirrors, so they may not all have the switch installed. A new hardtop comes with spin-locks.
The plastic window softtop should NOT be operated under 40 degree, so I use an electric blanket wrapped around the plastic window to keep it warm when the top is down at low temperatures. When the top is up, warming the interior warms the rear window to operating temperatures (and also keeps it fog free). If I can find the right fitting, I may plug the electric blanket into the hardtop prewired slot next year - the switch that warms the mirrors and hardtop window is already installed in the dash.
Wherever you live, BUY THE SEAT HEATERS!
Ad Sach
near Albany, NY
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