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There is a HVAC check valve on the passenger side should be black and egg shaped ..
Could be a vacuum line is unhooked from there
The upper and lower vent doors are operated by actuators that are controled by vacuum when there isnt enough vacuum in the system you usually only end up with defrosters and lower vents working..
The check valve in the engine bay is the 1st place I would check.
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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