V90 ventilation system
Recently the air flow through the face vents (and all other vents) has without warning reduced to almost nothing, even though the fan motor is working normally and responds to whichever speed is selected. Then without warning again, it will revert to normal flow operation. I understand it's a vacuum controlled/operated system - any ideas what I should look for to cure this please? There is no change in the poor air flow if I lift off the accelerator, or accelerate - it seems to decide for itself when to behave normally or not! Mostly it works normally, but without warning it will drop to "limp mode" air flow, which can hardly be felt at the centre/side vents outlet.
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