On Jul 12, 2010, at 2:44 PM, David Beierl wrote:

> At 02:27 PM 7/11/2010 Sunday, mark drillock wrote:
>> Yeah, you are right that the fan can push some fresh air out the end
>> vents when the vehicle is stopped in early types. There are some
>> gravity
>> flaps that push open when under way and let fresh air get directly to
>> the early hoses without passing through the fan.
>
> Bingo -- if you can't hear those flaps snap shut when you suddenly
> turn the fan on full speed, they are no doubt stuck open or
> completely fallen off (both from poor design choices) and will negate
> the effect of the blower.  The system will still work fine from ram
> air.
>
> They are designed to fail, difficult of access and hard to fix, sorry
> to say.  My fix on the '84 involved substituting metal end (pivot)
> pins for the worn out plastic, no mean trick in itself; and driving
> heated pins through the box itself to substitute for the silly little
> molded clips.  The system wouldn't be so bad except that the flaps
> hang from the open end of the clips -- the pins wear triangular and
> then jam or fall through completely.  Difficult of access is the
> polite way of describing the situation.
>
> Yours,
> David

Since my 84 flaps still work really well, I will treat them w/ the
respect that they still deserve.
Sometimes earlier is better?

YMMV,

Mr. BZ-no stinkin intermitent relay switch ain't 1 of them?