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Old 03-31-2010, 09:10 AM
scoodidabop's Avatar
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Join Date: May 2006
Location: Houston, TX
Posts: 381
AC vents reacting to throttle? Where do I start?

Whenever I apply my throttle more than halfway, my AC vents partially close and divert to my windshield defrost vents. If I take my foot completely off the throttle, the vents correct themselves (no defrost...) within a few seconds.

So it's clearly a vacuum related issue, but how on earth do I go about repairing this?? If all vacuum is released from the vent flap system, is it the "default" position to have the defrost flaps full open? Should I just cap off the vac line until winter comes and I need defrost again?

'85 W123 300D BTW...
'90 300SE --- 173k miles --- (Odometer just stopped working!)

'85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10

'82 300TDT --- 236,xxx miles --- (My first one) Sold July '09
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