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07-24-2022
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#1 |
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Join Date: Jun 2012
Location: fort worth
Posts: 183
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AC blows out floor and defrost vents?
My 1990 ZR-1 with C68 AC is not blowing air out of the dash air vents. It is blowing cold air out of the floor and defrost vents. Anyone else have this issue?
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07-25-2022
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#2 | |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: AC blows out floor and defrost vents?
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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07-25-2022
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#3 |
Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,593
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Re: AC blows out floor and defrost vents?
That is the default mode when failed, so that you can see in the cold or wet when defrost or defog is required.
Go to BATEE.com Bryan's site can help you determine and confirm which part has failed. As the poster above said, likely the controller, but there are multiple components that could cause this. Not complex if the programmer or controller. Check out his site. He is THE BEST! www.batee.com  Marty |
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07-25-2022
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#4 | |
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Join Date: Jun 2012
Location: fort worth
Posts: 183
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Re: AC blows out floor and defrost vents?
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07-25-2022
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#5 |
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Join Date: Aug 2006
Location: McLean, VA
Posts: 3,723
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Re: AC blows out floor and defrost vents?
Below Is QB93Z thread on replacing the programmer.
http://www.zr1.net/forum/showthread.php?t=27542 Jim as far as I know went in the deepest with HVAC diagnose and repair. Reach out to Jim (QB93Z) and tap his knowledge. Good luck! |
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07-25-2022
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#6 | |
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Join Date: Jun 2012
Location: fort worth
Posts: 183
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Re: AC blows out floor and defrost vents?
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I hope it's that easy! I replaced the ac programmer back in '97 and that job was no fun! |
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07-31-2022
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#7 |
 
Join Date: Sep 2021
Location: Florida
Posts: 29
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Re: AC blows out floor and defrost vents?
I?m having the issue where I have cold ac but it only blows out of the foot and defroster vents. I?m guessing it is possible the HVAC programmer then?
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04-05-2023
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#8 |
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Join Date: Jun 2012
Location: fort worth
Posts: 183
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Re: AC blows out floor and defrost vents?
I never followed up on my vent issue. It turned out to be the vacuum line to the ac controller was pinched between the plenum and injector housing.
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04-05-2023
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#9 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 899
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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.
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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. |
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