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Young1 · 04-05-2023

That is correct. Cruise and AC share a common vacuum source on RH plenum. Secondaries vacuum source is the pump and LH plenum. Stuff under the hot plenum shrinks and ages and gets loose. Not as likely under the dash. I would also consult the FSM and follow the diagnostic tree. Vacuum stuff is pretty easy. Electrical not so much. Your patience and diligence keeps the legend alive.

04-05-2023	#9
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 904	Re: AC blows out floor and defrost vents? That is correct. Cruise and AC share a common vacuum source on RH plenum. Secondaries vacuum source is the pump and LH plenum. Stuff under the hot plenum shrinks and ages and gets loose. Not as likely under the dash. I would also consult the FSM and follow the diagnostic tree. Vacuum stuff is pretty easy. Electrical not so much. Your patience and diligence keeps the legend alive. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.