Converting A/C to R134 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HomerJ · 02-12-2014, 10:08 PM

I've read up on the conversion as far as what needs to be replaced. Sounds like I can reuse the evaporator coil as long as it's thoroughly flushed.

I currently have it off the truck (reassembling after a 6+ year restomod), so is that something that should be done now or when the truck is assembled and ready for a charge or ???

spatz · 02-12-2014, 10:58 PM

IMO i would wait until all together to flush any dust or dirt that could be in the system or condensation. just my 2 cents

mrein3 · 02-13-2014, 08:50 AM

Quote:

Originally Posted by HomerJ

I've read up on the conversion as far as what needs to be replaced. Sounds like I can reuse the evaporator coil as long as it's thoroughly flushed.

I currently have it off the truck (reassembling after a 6+ year restomod), so is that something that should be done now or when the truck is assembled and ready for a charge or ???

You need to adjust the POA for using R134a. There used to be a real good link I could post from autoacforum.com but the pictures disappeard. Maybe click over there and google around for the pictures to see if they are still around. Look for "POA Tester". Basically you need to turn an adjustment screw in the POA to make it work with the R134a. It has a different boiling point than R12. I've been running my truck for a couple of years now on R134a after flushing the system, adjusting the POA, and pulling a good vacuum before charging.

Bigdav160 · 02-13-2014, 09:55 AM

While not recommended by car manufactures, others have claimed success using Easter oil instead of PAG.

PAG will eventually ruin non barrier hoses.

Andy4639 · 02-13-2014, 10:48 AM

I would wait until you are ready to do the final assembly and do a retro mod change as I did. Mine looks all factory except I used a late model compressor. I used all the new condensor, acumaltor, dryier and no sight glass. It works great and the newer tubes let the 134-a expand better and work more efficiently.

This is it today!

HomerJ · 02-14-2014, 09:40 AM

All good info. Thanks to all!

Time to start assembly.....

02-12-2014, 10:08 PM	#1
HomerJ Registered User Join Date: Apr 2007 Location: Norman, OK Posts: 222	Converting A/C to R134 I've read up on the conversion as far as what needs to be replaced. Sounds like I can reuse the evaporator coil as long as it's thoroughly flushed. I currently have it off the truck (reassembling after a 6+ year restomod), so is that something that should be done now or when the truck is assembled and ready for a charge or ??? __________________ 67 C-10 LWB "Cow-butt-spotted" (neighbor's term) - work in progress. 350/TH400/3.73 67 Chevelle SS Clone 454/TH400/3.73

02-12-2014, 10:58 PM	#2
spatz Registered User Join Date: Mar 2009 Location: Flint, Mi Posts: 200	Re: Converting A/C to R134 IMO i would wait until all together to flush any dust or dirt that could be in the system or condensation. just my 2 cents

02-13-2014, 09:55 AM	#4
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Converting A/C to R134 While not recommended by car manufactures, others have claimed success using Easter oil instead of PAG. PAG will eventually ruin non barrier hoses. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

02-13-2014, 10:48 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Converting A/C to R134 I would wait until you are ready to do the final assembly and do a retro mod change as I did. Mine looks all factory except I used a late model compressor. I used all the new condensor, acumaltor, dryier and no sight glass. It works great and the newer tubes let the 134-a expand better and work more efficiently. This is it today! __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-14-2014, 09:40 AM	#6
HomerJ Registered User Join Date: Apr 2007 Location: Norman, OK Posts: 222	Re: Converting A/C to R134 All good info. Thanks to all! Time to start assembly..... __________________ 67 C-10 LWB "Cow-butt-spotted" (neighbor's term) - work in progress. 350/TH400/3.73 67 Chevelle SS Clone 454/TH400/3.73



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