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Old 07-19-2020   #21
Subfixer
 
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Join Date: Sep 2018
Location: Groton, CT
Posts: 382
Default Re: Weak fans inside car at highest setting.

Yes, outer side of HVAC box. I removed the passenger side of the box to replace the evaporator. The screen comes out first, then the evaporator. There is a large rubber seal that surrounds the evaporator. It is larger on the left side, looking at the installed evaporator. Apparently, several people have found this seal missing due to previous repairs by prior owners. If the seal is missing, outside air bypasses the evaporator.
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1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers
2018 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black
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Old 07-19-2020   #22
lfalzarano
 
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Default Re: Weak fans inside car at highest setting.

Pictures please would be helpful.


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Old 07-19-2020   #23
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Default Re: Weak fans inside car at highest setting.

http://zr1.net/forum/showthread.php?...ght=Evaporator

Hope the link works.
In the picture in post #6, the outer half of the HVAC box is part 7, the screen is part 9, the seal is part 6, evap is part 5.
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1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers
2018 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black
2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige
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Old 07-19-2020   #24
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Location: Peoria, AZ
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Default Re: Weak fans inside car at highest setting.

Replace the blower fan. After 25 plus years of performance they do wear out. GC
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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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Old 07-20-2020   #25
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
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Default Re: Weak fans inside car at highest setting.

Quote:
Originally Posted by Flyman 27 View Post
When mine was giving me problems with fan speed/power, it turned out to be the fan speed controller on top of the A/C plenum under the hood.
Any photos of what this part may look like ?
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Old 07-20-2020   #26
GOLDCYLON
 
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Default Re: Weak fans inside car at highest setting.

Quote:
Originally Posted by Vette73 View Post
Any photos of what this part may look like ?




http://www.zr1.net/forum/showthread....C+fan+resistor


Pic #1
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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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Old 07-24-2020   #27
Ccmano
 
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Join Date: Jun 2006
Location: Sparks, NV
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Default Re: Weak fans inside car at highest setting.

Here are some photos of the fan speed controller. Replacing mine helped the blower speed and volume. Make sure you get an exact and correct replacement. There are some that look similar but do not fit.
H








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Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold
08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold
05 C6 Z51 Red/Black Sold
90'ZR-1 #1723 Black/Gray Sold but not forgotten
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Old 07-26-2020   #28
lfalzarano
 
Join Date: Feb 2011
Location: Clayton, North Carolina
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Default Re: Weak fans inside car at highest setting.

Where did you find it and part #?


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Old 07-26-2020   #29
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Default Re: Weak fans inside car at highest setting.

Quote:
Originally Posted by lfalzarano View Post
Where did you find it and part #?


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For 90'-92' GM #16086891 AC/Delco #15-71642.
93'-96' GM#16174981 AC/Delco #15-71970.
H
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90'ZR-1 #1461 Red/Black
Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold
08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold
05 C6 Z51 Red/Black Sold
90'ZR-1 #1723 Black/Gray Sold but not forgotten
91' Z51 L98 White Vert. My First, you always remember your first. Sold.
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