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Blower fan revamp

BMW 635CSi on Thu June 11, 2009 7:57 PM User is offline

Year: 1986
Make: BMW
Model: 635CSi
Engine Size: 3.5
Refrigerant Type: R12
Ambient Temp: 90
Country of Origin: United States

Hello guys,
I have an older classic BMW. It actually has 2 different evaporators.
One for the front center grill and one for the rear that has a
cabinet to store some cold drinks in it. The rear has regular vents also
that blow forward.
Anyway my main question is this: On this car many owners have complained that the
rear AC is much cooler and better than the front.
Both systems are roughly the same size so there should not be a significant difference
in performance. My thoughts are that the front AC has a decent size twin cage blower.
For some reason BMW thought to have the fan draw air through the center grill
right above the gear shifter. Where most of the heat rises .

Now I am no expert but I thought a squirrel cage blower fan
works best to have the air enter on the outside of the cages. My car has the entrance
on the inside of the cages. There is a big electric motor blocking most of the air.
I am tempted to install some inlet holes on the side of the center console to allow
more air to enter the blower. Can I have too much air enter the blower fan?

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