Agent_13

I need a little help with my 5spd 1989 944s2. This may be unrelated, but I just replaced My Timing Belt, Rollers, and Water Pump.The problem is, when I accelerate it seems the Air Conditioning Fan slows down, or more accurately the Recirculation Flap switches states. I believe the recirculation flap works off a vacuum line, but I can't find anything loose under the hood. Has anybody else had this problem? Any help would be appreciated.