Standard Air misbehaving - accelleration?
Hey all, my standard air in my EA-II Fairmont is behaving a little strangely - in that everything works normally (hot/cold, a/c (less gas), face, footwell, windscreen, recirc etc) except...
under mildly heavy accelleration (close to WOT, and including WOT but not limited strictly to) the air tends to switch from the face vents (at all fan speeds) to only the passenger footwell.. this is quite noticable with no music on etc as you can hear the air stop flowing from the normal "face" vents (As well as feeling it stop flowing), and if sitting in the passenger seat in shorts this is more noticable as it leaves a nice rush of cold air on the legs... which my GF tends to dislike... lol.
Anyway, any ideas as to what could be causing it? I thought blend door but then I would have thought it wouldnt change modes between face, floor, windscreen etc when i wanted it to...
maybe i've managed to disconnect an engine bay vacuum hose could this be it?
Rosewood EAII Fairmont 02/90. MPFI 3.9L (formerly CFI), 4spd BTR Auto. Skyline geared 3.45g open center 28 spline 4 pinion differential & axles. 2 1/2" Cat Back Exhaust. King Super Low Springs. Sound: Equalization and amplification by Clarion; Head unit by Sony, Front, Rears and Sub by Pioneer. Planned mods - t5, Extractors, Painting Grey Strips and new front and rear bar.