Residue heat function
#11
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Join Date: Aug 2004
Location: Quincy, MA, USA
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My Ride: E60 530i
Model Year: 2004
Engine: M54
#13
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Location: Quincy, MA, USA
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My Ride: E60 530i
Model Year: 2004
Engine: M54
#14
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My Ride: E60 530i
Model Year: 2004
Engine: M54
I tried this feature last night (1st time I use it since 2004), I could only feel the cold air coming out of the vents under the dash (footwell), not warm air !! The car had been driving for about 25 minutes and outside temperature was at 9F. No air coming out of the center vents, only vents in both footwell area.
So, this feature is broken in my car ?
So, this feature is broken in my car ?
#15
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My Ride: 545i sport
Model Year: 2004
The "residual heat" or "rest" button works via a small electric pump (auxillary water pump) that circulates water from radiator through heater core and back. The feature will produce heat until the coolant has lost all latent heat (i.e. if you keep restarting the feature after it shuts off). The pump is located on the left (aft) side of the radiator in the rats nest of water hoses.
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My Ride: 2008 550i SA M-Sport Package
I wouldn't use that feature more than once between drives because it kills your battery. I once used it twice in a row while just sitting in my car and I ended up getting all sorts of warning, the kinds of things you see when your battery is low. So if your going to be sitting in your car for more than one cycle, just start the car.
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