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**oldgold70c10** · 08-06-2018, 02:46 PM

You can make your own drop-in R-12 replacement using a propane/isobutane mix, which is also available commercially if you don't want to make it yourself.

It is just as safe as R-134A, the flashpoint is higher than the 134a/oil mix that would be running thru your system.
You could use the propane straight, the mix is so it will mix with the oil better.

Interestingly, the van I drive at work is a 2000's Chevy van using R134a and it's performance driving around town is like my '78, yet it was built for 134a.

08-06-2018, 02:46 PM	#29
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,023	Re: Parallel Flow Condenser You can make your own drop-in R-12 replacement using a propane/isobutane mix, which is also available commercially if you don't want to make it yourself. It is just as safe as R-134A, the flashpoint is higher than the 134a/oil mix that would be running thru your system. You could use the propane straight, the mix is so it will mix with the oil better. Interestingly, the van I drive at work is a 2000's Chevy van using R134a and it's performance driving around town is like my '78, yet it was built for 134a. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel Last edited by oldgold70c10; 08-06-2018 at 05:43 PM.