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      11-15-2012, 12:33 PM   #31
Tom K.
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Drives: '07 328iT, '13 Boxster
Join Date: Mar 2008
Location: Maryland

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From the '07 E90/91 manual:

Residual heat
The heat stored in the engine is
used to heat the passenger compartment,
e.g. while stopped at a
school to pick up a child.
The function can be switched on when the following
conditions are met:
> Up to 15 minutes after the engine has been
switched off
> While the engine is at operating temperature
> As long as battery voltage is sufficient
> At an outside temperature below 77oF/25oC
The LED is lit when the function is on.
As of radio readiness, you can set the interior
temperature, the air flow rate and the air distribution

Tom