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#1 |
Registered User
Join Date: Jan 2018
Location: TN
Posts: 263
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Which AC compressor for r134 AC?
I bought all the factory stuff I need to convert my heater truck to AC. I was going to go with vintage air but wanted to be able to pull in fresh air because the south is very humid.
Anyway. I think I have figured out most of the stuff I need to do a r134 conversion when I install everything. The only thing I am still up in the air about is the compressor. I was looking at an AC delco A6 compressor from rock auto. Would that work without pulling too much HP away from my engine? Is the sanden a better option? Any more options? I want to be able to stay the coolest and use as little HP as possible. I’m pulling 16.5 mpg at 70 with my 350/sm465 307 rear right now and would I like to not take it down too much by adding AC. I also will usually drive the truck at 1300-1500 rpm in town. It just putts. I drive it like an old man (no offense to any old men). Would the A6 even work well at idle or low rpms? Thank you. |
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#2 | |
Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Which AC compressor for r134 AC?
I drive like you do. I used a 4seasons aluminum A6 which works fine. Since I bought that thing I've heard some have had them fail. If I were to do it again I'd get a rebuilt GM/Delco/Harrison/Frigidaire. I used this condenser with the Vintage Air mount. I don't notice the HP loss and it gets plenty cold.
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#3 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,388
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Re: Which AC compressor for r134 AC?
I'd use the stock type A-6 compressor if the conversion uses a POA valve adjusted for 134. If you are going to a switch to cycle the compressor, use the R-4 compressor, because the A-6s don't suffer cycling gladly and fail fairly quickly, based on what I've seen over the years, here. You probably already know, but the oil for a 134 system is different.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#4 |
Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,081
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Re: Which AC compressor for r134 AC?
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I run the A6. Next time it fails...I'm replacing it with a Sanden. -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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#5 | |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Which AC compressor for r134 AC?
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#6 | |
Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Which AC compressor for r134 AC?
Yep, the clutches don't have the surface area to by cycled on and off.
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#7 | |
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Location: New Madison, Ohio
Posts: 21,365
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Re: Which AC compressor for r134 AC?
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Thanks
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#8 |
Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Which AC compressor for r134 AC?
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#9 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: Which AC compressor for r134 AC?
I use an A10, aluminum replacement for the A6. Factory AC in my 68. No leaks, no belt squealing, been working great for about 4 years now. I used R12 as original. I will never use an A6 again.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#10 |
Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Which AC compressor for r134 AC?
Who made your compressor and the part number? When I bought mine a few years ago I understood I was buying an A10 but the manufacturer's description says it's an A6. Mine is a 4 Seasons 58098.
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#11 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Which AC compressor for r134 AC?
I have been the A6 aluminum replacement (four seasons) for years. Works fine. But, it came out with the engine to replaced with a LM7 LS engine...switching to R134a and using the Denso LS compressor. Going to try and sell the engine/700R4 as a package including the compressor.
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#12 | |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,388
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Re: Which AC compressor for r134 AC?
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#13 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Which AC compressor for r134 AC?
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#14 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: Which AC compressor for r134 AC?
I don’t recall the manufacturer. I would imagine they all come from the same place, with each vendor putting their name on it. I bought an entire kit from autozone that included the compressor, drier/receiver, expansion valve, and a quart of mineral oil. They called it an A6 replacement but it’s an A10.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#15 | |
Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Which AC compressor for r134 AC?
So maybe mine is actually an A10. I'm using ester oil in case I didn't like the R134 result and opted to switch back to R12. With the POA properly adjusted R134 works just as well as R12. I love POA systems!
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#16 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: Which AC compressor for r134 AC?
I never had any luck with r134 in a factory AC system conversion, even adjusting the poa and other factors. If it works for you, great. I’m happy with r12. I have stockpiled both and use 134 in all of my newer cars that call for it.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#17 | |
Registered User
![]() Join Date: Mar 2014
Location: Simi, CA
Posts: 495
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Re: Which AC compressor for r134 AC?
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Having a system that lets you open & close the fresh air intake is the best option but max cooling & dehumidification is accomplished when the air is recycled.
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