Re: HVAC Servos

["Jay D. Bichanich" <jaybich@earthlink.net>]

This particular servo is a two-position vacuum servo.  One line makes it move
halfway from its 'rest' position, and the other line makes it move all the way
from its rest position.  There's an internal spring that allows the servo to
return to its rest position when neither line is supplying vacuum.

Sound right?  Should be.



BTW, I recently lubed my vacuum distributor with NEO watercraft grease (just a
little bit), and now my vent control knob works more smoothly than it ever did.
In fact, she goes ALL the way to the left so that my recirculation servo now
works properly for super cool AC operation.  Pretty cool!!


Jay Bichanich
86.5 Scirocco 16V Tornado Red (Original owner)




Bill.Scarince@tenneco-automotive.com wrote:

> On my '88 16v w/AC, there's a servo that when extended allows air to come from
> the center vent, and when retracted diverts air to the floor vents ("Heat").
> Besides the vacuum line on the end of the actuator, there's another one in the
> middle.  Anyone know what the one in the middle does??
>
> Bill
>
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