A/C r12 to r134 question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Orange71shorty** · 01-16-2011, 12:15 PM

Hey Guys
I am converting my original air truck to the new refrigerant. I have the new o-rings and valves, are the original lines and muffler compatable with r134?

*mrhino* · 01-16-2011, 01:38 PM

probably not, the r12 system uses mineral oil and r134 uses pag the two dont jive together. you should replace the old rubber hoses, they will be soaked with mineral oil. and then you must flush all the components, i.e evaporator, condenser, and metal lines. You should replace the accumulator (dryer) and expansion valve

*Kokomoooo* · 01-16-2011, 03:19 PM

Why not just stick with r-12.(pricy yes) There are people selling it all over ebay. r134 does not cool near as well as r-12, you'll hate it.

01-16-2011, 12:15 PM	#1
Orange71shorty Senior Member Join Date: Feb 2009 Location: Helena, Montana Posts: 622	A/C r12 to r134 question Hey Guys I am converting my original air truck to the new refrigerant. I have the new o-rings and valves, are the original lines and muffler compatable with r134?

01-16-2011, 01:38 PM	#2
mrhino Account Suspended Join Date: Aug 2007 Location: USA Posts: 1,223	Re: A/C r12 to r134 question probably not, the r12 system uses mineral oil and r134 uses pag the two dont jive together. you should replace the old rubber hoses, they will be soaked with mineral oil. and then you must flush all the components, i.e evaporator, condenser, and metal lines. You should replace the accumulator (dryer) and expansion valve Last edited by mrhino; 01-16-2011 at 01:39 PM.

01-16-2011, 03:19 PM	#3
Kokomoooo Account Suspended Join Date: Jan 2011 Location: Kokomo Indiana Posts: 56	Re: A/C r12 to r134 question Why not just stick with r-12.(pricy yes) There are people selling it all over ebay. r134 does not cool near as well as r-12, you'll hate it.



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