I wonder if this is related to a problem we've been having with the AC
on our '98 Z3 convertible, 2.8 litre. We cannot turn it completely off.
Instead of having 0 1 2 3 4 as controls, it gives us 1 1 2 3 4, so there
is always cold blowing. Other than that, it works great! Even when the
outside temp is 90 to 95, the air is chilling in the cockpit.
And yes, I can move the fan by hand when the engine is off and cold.
Most cars' blower motor controls are set to run the fan at low speed
all the time while the AC compressor is engaged. It's done to keep
air flowing through the evaporator matrix to prevent ice from building
up on it. I bet the fan will go off completely if you turn off the AC
Yes, in layman's terms a fluid that evaporates sucks in heat; one that
condenses releases heat. It's all made even more efficient and
worthwhile by the latent heat step in the temperature profile of the
transition. But this is getting all too damned scientific.
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