Weird (?) AC problem - ZR-1 Net Registry Forums

Gary Yarbrough · 09-28-2009

Along with the hesitation issues I've been fighting, I've also got a weird AC issue.

From time to time, my AC will just cut out altogether. A real pain here in the south where it can get pretty hot/humid. It seems that if I rev the car a bit, it will kick back on. Turing the AC on and off doesn't really help.

Any suggestions? I'm wondering if this, along with the hesitation could be pointing to an ECM problem...

gbrtng · 09-28-2009

Time to have a competent AC shop hook up the gauges and see if there's enough R12 left.
As the R12 charge slowly leaks out, the compressor will cycle on and off to the point where if there isn't enough pressure it will not turn on at all.

GOLDCYLON · 09-28-2009

Could be a intermittent issue with the blower motor stopping or the AC rheostat which is also next to the blower. Next time it does this pull over and bang on the backside of the blower motor. If the motor picks back up again in air volume you need to replace the blower.

10-03-2009

Gary, make sure you check your pressure switches.

Gary Yarbrough · 10-05-2009

I'll check the pressure switches. Also, the next time it quits on me, I'll give the motor a good wack and see if it picks back up!

gbrtng · 10-05-2009

Quote:

Originally Posted by Gary Yarbrough

I'll check the pressure switches. Also, the next time it quits on me, I'll give the motor a good wack and see if it picks back up!

Both pressure switches must be closed for the AC clutch to engage. They're normally closed; one opens when the internal pressure is too low (no R12) and the other one opens when the system pressure is too high - safety valve sort of.

Gary Yarbrough · 02-04-2011

Wow...I can't believe that I never posted the solution to my problem.. It's kind of funny that I'm doing it in the middle of winter!

The entire issue turned out to be a bad connector to the blower motor control module. I got a new connector and haven't had any problems since!

GOLDCYLON · 02-04-2011

Cool I wondered about that one.

carter200 · 02-04-2011

Quote:

Originally Posted by GOLDCYLON

Cool I wondered about that one.

me too

09-28-2009	#1
Gary Yarbrough Join Date: Nov 2008 Location: Wilson, AR Posts: 63	Weird (?) AC problem Along with the hesitation issues I've been fighting, I've also got a weird AC issue. From time to time, my AC will just cut out altogether. A real pain here in the south where it can get pretty hot/humid. It seems that if I rev the car a bit, it will kick back on. Turing the AC on and off doesn't really help. Any suggestions? I'm wondering if this, along with the hesitation could be pointing to an ECM problem...

09-28-2009	#2
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,179	Re: Weird (?) AC problem Time to have a competent AC shop hook up the gauges and see if there's enough R12 left. As the R12 charge slowly leaks out, the compressor will cycle on and off to the point where if there isn't enough pressure it will not turn on at all. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer

09-28-2009	#3
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Weird (?) AC problem Could be a intermittent issue with the blower motor stopping or the AC rheostat which is also next to the blower. Next time it does this pull over and bang on the backside of the blower motor. If the motor picks back up again in air volume you need to replace the blower. __________________ 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

10-03-2009	#4
Jeffvette Guest Posts: n/a	Re: Weird (?) AC problem Gary, make sure you check your pressure switches.

10-05-2009	#5
Gary Yarbrough Join Date: Nov 2008 Location: Wilson, AR Posts: 63	Re: Weird (?) AC problem I'll check the pressure switches. Also, the next time it quits on me, I'll give the motor a good wack and see if it picks back up!

02-04-2011	#7
Gary Yarbrough Join Date: Nov 2008 Location: Wilson, AR Posts: 63	Re: Weird (?) AC problem Wow...I can't believe that I never posted the solution to my problem.. It's kind of funny that I'm doing it in the middle of winter! The entire issue turned out to be a bad connector to the blower motor control module. I got a new connector and haven't had any problems since!

02-04-2011	#8
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Weird (?) AC problem Cool I wondered about that one. __________________ 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