There is a guy named SunMan on Mbworld forums that has installed the factory version on his W203 C320 Sedan. He stated it actually has a fuel line that connects to the fuel system and then a little gas or diesel heater that heats the coolant lines. It also has a little pump to circulate the warmed fluid. After 20 minutes I think it also turns on the fan in the HVAC system as well to warm the inside of the vehicle. Set up is in the Multi-Function Display on the dash and set with the steering wheel controls. You can set certain times of the day for this to operate as well as use a remote control to activate as well. This guy also has distronic, parktronic, folding mirrors, triple trunk locks and a few other goodies from the Euro models on his US model car. He has stuff that is not even normally offered on a C Class. Currently working on installing Active Heated/Ventilated Seats from a CLK as well.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....