C60 A/C Help - ZR-1 Net Registry Forums

-=Jeff=- · 06-25-2009

car has refrigerant in the system and the systen worked last year. now the A/C Compressor is not turning on.

All buttons seem to function correctly and the air blows out of the proper vents for each function.. bu the Compressor does not kick on.

I have been going through the FSM and in section 8A-64 ( C60 compressor controls) is where I am at now..
looking at page 8A-64-4 Symptom Table

Mine is for A/C Compressor Clutch will not engage.. use Chart #2 page 8A-64-6

Chart 2 has me checking Pin A1 of Connector C1 for the HVAC Controller with a test light.. It lights..

Next step check ECM Green Connector (VIN J) Pin 2, turn key on, select MAX, Defrost Bilevel, Normal AC.. Test light should light but does not..
it then says to check circuit 259 and that is okay, so is says AC unit is bad.

I bought a BRAND NEW unit.. Same thing, so I am doubting it is the AC Controller..

now what?? I would like to get the AC working, but it will not.. this wire to the ECM is the A/C Request Line.. next is to bypass it and run 12v to see if it works..

but what else can i check?

-=Jeff=- · 06-26-2009

Okay checked it again with my Scanner.. that line is switching (Datlogger shows the switching)

so I will checkout the Compressor line and relay, hopefully Sunday

GOLDCYLON · 06-27-2009

Jeff Pm the guy over on the other forum that appears to be the AC guru on the c4s. SunCR is his handle. GC

USAFPILOT · 06-27-2009

Speaking of AC...is there anything we can do to just increase the strength of the airflow?

I heard the ZR-1 AC system is different than the standard C4...which is why we have the solar windshield...but the blower in the dash should at least be the same right?

GOLDCYLON · 06-27-2009

Replace the blower motor. The difference is night and day. The compressor is smaller and the solar glass was susposed to make up for the difference. The Blower fan is identical to any C4.

-=Jeff=- · 06-27-2009

Quote:

Originally Posted by GOLDCYLON

Replace the blower motor. The difference is night and day. The compressor is smaller and the solar glass was susposed to make up for the difference. The Blower fan is identical to any C4.

Compressor looks the same as the one in my old 89, just different mounting

I thought it was engine heat that was the main reason for the solar windshield

GC,

AC is fixed.. I troubleshot it last night and the Clutch relay was not even in the socket. I must have bumped it while R&R the brake Booster..

AC works, but I need to finish charging it, still is a bit low..

GOLDCYLON · 06-28-2009

Quote:

Originally Posted by -=Jeff=-

AC is fixed.. I troubleshot it last night and the Clutch relay was not even in the socket. I must have bumped it while R&R the brake Booster..AC works, but I need to finish charging it, still is a bit low..

Awesome I love the easy fixes. I read about that windshield tidbit somewhere.

06-25-2009	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,139	C60 A/C Help car has refrigerant in the system and the systen worked last year. now the A/C Compressor is not turning on. All buttons seem to function correctly and the air blows out of the proper vents for each function.. bu the Compressor does not kick on. I have been going through the FSM and in section 8A-64 ( C60 compressor controls) is where I am at now.. looking at page 8A-64-4 Symptom Table Mine is for A/C Compressor Clutch will not engage.. use Chart #2 page 8A-64-6 Chart 2 has me checking Pin A1 of Connector C1 for the HVAC Controller with a test light.. It lights.. Next step check ECM Green Connector (VIN J) Pin 2, turn key on, select MAX, Defrost Bilevel, Normal AC.. Test light should light but does not.. it then says to check circuit 259 and that is okay, so is says AC unit is bad. I bought a BRAND NEW unit.. Same thing, so I am doubting it is the AC Controller.. now what?? I would like to get the AC working, but it will not.. this wire to the ECM is the A/C Request Line.. next is to bypass it and run 12v to see if it works.. but what else can i check? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

06-27-2009	#3
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: C60 A/C Help Jeff Pm the guy over on the other forum that appears to be the AC guru on the c4s. SunCR is his handle. GC __________________ 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

06-27-2009	#4
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Re: C60 A/C Help Speaking of AC...is there anything we can do to just increase the strength of the airflow? I heard the ZR-1 AC system is different than the standard C4...which is why we have the solar windshield...but the blower in the dash should at least be the same right?

06-27-2009	#5
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: C60 A/C Help Replace the blower motor. The difference is night and day. The compressor is smaller and the solar glass was susposed to make up for the difference. The Blower fan is identical to any C4. __________________ 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

06-26-2009	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,139	Re: C60 A/C Help Okay checked it again with my Scanner.. that line is switching (Datlogger shows the switching) so I will checkout the Compressor line and relay, hopefully Sunday __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978