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06-17-2018
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#1 |
 Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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R-12 to R-134 conversion
Gents,
About to swap over to R-134. I've got the compressor and accumulator. To be clinically correct, I'll need to swap out the high pressure line to R-134 configuration. Anyone with one in good condition to sell, please send me a PM, otherwise I'll TIG in a new high pressure port. What about the high and low pressure switches. Are the R-12 switches compatible with R-134 and the higher pressures? If they need to be replaced, are they available? Thanks! Steve Sent from my XT1585 using ZR-1 Net Registry mobile app |
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06-17-2018
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#2 | |
   
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: R-12 to R-134 conversion
Quote:
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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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06-17-2018
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#3 |
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Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: R-12 to R-134 conversion
134 operates at a higher pressure and expansion is the cooling process, so I get the need for proper pressure switches, but can't make the case for a different condenser unless the R-12 version is working at it's pressure limit, or, the R-134 unit has significantly more heat exchange surface area. I would be more inclined to think the expansion valve is different for R-134 to get proper cooling phase change (liquid to gas). Interested in thoughts.
I'm not wanting to chase R-12 at the price I have to pay for it. I'd rather modernize the system while I've got it down. Sent from my QTAIR7 using ZR-1 Net Registry mobile app |
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06-17-2018
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#4 |
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Join Date: Aug 2006
Location: McLean, VA
Posts: 3,723
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Re: R-12 to R-134 conversion
High pressure switch for 134a opens (and open is fan run position) at 240 psi or close to it - high pressure switch for R-12 will not work correctly. Also, high pressure switch for 134a is almost none existent.
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06-17-2018
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#5 | |
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Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: R-12 to R-134 conversion
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Sent from my QTAIR7 using ZR-1 Net Registry mobile app |
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06-17-2018
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#6 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: R-12 to R-134 conversion
I believe the stock cycling switch has a screw adjustment between the prongs.. turnis 1/4 turn CCW for r134a
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 Last edited by -=Jeff=-; 06-17-2018 at 11:45 PM. |
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06-17-2018
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#7 | |
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Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: R-12 to R-134 conversion
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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06-17-2018
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#8 | |
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Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: R-12 to R-134 conversion
Quote:
Steve Sent from my QTAIR7 using ZR-1 Net Registry mobile app |
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06-18-2018
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#9 |
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Join Date: Apr 2018
Location: Lone Star State
Posts: 100
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Re: R-12 to R-134 conversion
Curious as to why switching from R-12 to R134?
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06-18-2018
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#10 |
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Join Date: Aug 2015
Location: Magnolia, Texas
Posts: 884
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Re: R-12 to R-134 conversion
Availability and cost of 134a vs 12. Current system has a slow leak. PITA finding and buying R-12. Just not worth the headaches to me. If I were buying another pre-94 Corvette and the prior owner had done a proper job of converting to 134a, I would pay extra for the upgrade.
Sent from my QTAIR7 using ZR-1 Net Registry mobile app |
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