On Wed, 2 Jan 2013 00:00:28 -0800 (PST), email@example.com
Where is the air intake for the cabin filter? If it is in the
cowling, it may be getting a lot of particulate, such as pollen, when
the car is sitting and it then gets sucked in when you start the car
and the blower goes on.
I would guess that the engine sucks in less air than the cabin? Also
look of the size of engine air intakes as opposed to the size of cabin
air intakes - the size of the vents around the HVAC blower motor (much
larger for cabin).
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