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figgy said:
Has anybody modified their vent system to boost the amount of fresh air coming in through the vents beyond the somewhat feeble amount with the fan at max?

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Another problem in addition to increasing the flow is the heating of the air due to the intake location, cowl at the base of the windshield and the proximity of the heater core. Expect 10+F additional heating on warm days.

Its both a problem of intake location and the available "real estate" under the dash. There's simply not enough space to insulate fresh air from the heater core. The heater core needs a small continuous flow to prevent it from clogging. Without this flow mineralization and galvanic corrosion would accelerate the core's aging.
 
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