OK - Shot my self in the foot on that one. Did the ICV get blown thro with compressed air to clear blockages? Also is the ICV the type with the moving slide? The 'book' test is to shake the unit and check resistances. If the ohm meter is attached and the unit moved over its operating range with a pencil or similar you might find a 'dead' part of the track - no fix only replace.
Good - Fast - Cheap: Pick any two.
E23 735i; E30 318i; E32 735iL (X 2 - 1 White and 1 Light Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i