> Why do it?
>
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> Rather than mess about with heaters you should be sure the car's battery
> is in good condition and the connections to it are clean and tight.
True, but its a question of economy. The 110 engine takes 20 l / 100 km
during warm up. That is for 10 km cold driving 1 l = 1.x Eur extra in
Europe. If you get it warmed up to 90 degree C at a cheaper price its
real money (and a working heater and defroster from start).

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Roland Franzius