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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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 Posted: Sun Feb 17, 2013 10:46 am Post subject: A/C Info Needed |
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Need the refrigerant capacity for a '75 super with dealer installed A/C.
Compressor is a Aspera Model # HG500.
It's already been converted to R134a.
Did a rudimentary search and didn't really find anything.
Thanks
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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GA_Boy
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Joined: October 10, 2006
Posts: 1405
Location: Jefferson, GA
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| Posted: Sun Feb 17, 2013 11:36 am Post subject: |
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When recharging mine which is a from a GEO I use the Ambient temperature/PSI method. For instance with the pressure equalized at 70* Farenheit the pressure should be 71PSI. For 75* PSI=79.1, etc. I got a chart off line a few years back.
I don't know if this is the best method but it's what I use.
Marvin |
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Cusser
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Joined: October 02, 2006
Posts: 33501
Location: Hot Arizona
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| Posted: Sun Feb 17, 2013 11:41 am Post subject: |
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Marvin's way is a good start - the only data, if you can find it - would be for ounces R-12 required. Typically, about 80% of that is used with R134a.
You'll need to use the high side pressure readings, want it at about 250 psi at like 1500-2000 rpm engine speed, compressor engaged.
You'll need to pull a good vacuum first (you already know that),then add refrigerant, then get the engine on and AC on to pull in the remainder of the refrigerant, unless you've got access to a fancy machine that can just add by weight.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Sun Feb 17, 2013 12:07 pm Post subject: |
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| Quote: |
| unless you've got access to a fancy machine that can just add by weight. |
I do have a Robinaire fancy machine that adds by weight.
That's why I'm looking for the exact amount.
That number wasn't on a sticker under the decklid for some reason.......... 
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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GA_Boy
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Joined: October 10, 2006
Posts: 1405
Location: Jefferson, GA
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| Posted: Sun Feb 17, 2013 1:18 pm Post subject: |
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I may be wrong but I think you will have to do it the old fashoned way. 
Reasons are that the system was designed for one type freon and converted to another plus the fact that the compressor has been changed and the volumn may be different. That means that any original amounts/pounds wouldn't be right. Be sure to put oil in the new compressor if it didn't already come with it.
Marvin |
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joebennettPA
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Joined: August 09, 2012
Posts: 149
Location: USA 19054
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| Posted: Sun Feb 17, 2013 4:20 pm Post subject: |
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I have a 75 super with dealer installed ac, tell me where I could look on mine for the info, and I will check for you, only has 9k miles, and all stickers seam to still be intact
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75 "La Grande" super <10k miles, ac,sport shifter,sport steering wheel,sunroof, chrome sport wheels, Viper Green, All original factory/Dealer options! (sold)
73 super, ON THE ROAD!! 14month rehab!
1982 rabbit caddy! |
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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Mon Feb 18, 2013 11:22 am Post subject: |
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| GA_Boy wrote: |
I may be wrong but I think you will have to do it the old fashoned way.
Reasons are that the system was designed for one type freon and converted to another plus the fact that the compressor has been changed and the volumn may be different. That means that any original amounts/pounds wouldn't be right. Be sure to put oil in the new compressor if it didn't already come with it.
Marvin |
Not a new install.
System was real low when we pulled the R134a out so we did not get an accurate weight.
Had to remove compressor to pull the engine.
| joebennettPA wrote: |
| I have a 75 super with dealer installed ac, tell me where I could look on mine for the info, and I will check for you, only has 9k miles, and all stickers seam to still be intact |
Not sure there were any stickers on the dealer install Joe.
I'd appreciate you looking yours over if you can.
That would get us close then we could fine tune it with the gauge readings.
I was just giving Cusser a bit of flack with the sticker comment....
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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Cusser
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Joined: October 02, 2006
Posts: 33501
Location: Hot Arizona
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| Posted: Mon Feb 18, 2013 12:23 pm Post subject: |
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| turboblue wrote: |
| Had to remove compressor to pull the engine. |
I could pull the engine on my '70 without disconnecting the AC lines by unbolting the compressor and leaning it off to the side.
| turboblue wrote: |
Not a new install.
System was real low when we pulled the R134a out so we did not get an accurate weight.
Had to remove compressor to pull the engine. |
Sounds like there's a leak there !!!
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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GA_Boy
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Joined: October 10, 2006
Posts: 1405
Location: Jefferson, GA
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| Posted: Mon Feb 18, 2013 12:32 pm Post subject: |
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turboblue----------sorry I thought you added a new compressor.
cusser------------I strap a 2 x 4 across my roof rack and suspend the compressor if I pull the engine. |
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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Mon Feb 18, 2013 4:18 pm Post subject: |
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| Cusser wrote: |
| turboblue wrote: |
| Had to remove compressor to pull the engine. |
I could pull the engine on my '70 without disconnecting the AC lines by unbolting the compressor and leaning it off to the side.
| turboblue wrote: |
Not a new install.
System was real low when we pulled the R134a out so we did not get an accurate weight.
Had to remove compressor to pull the engine. |
Sounds like there's a leak there !!! |
This is a 75, no such luck........... 
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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Joel
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Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Mon Feb 18, 2013 4:23 pm Post subject: |
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WHat's made you stick with the old piston compressor?
Surely now while you have the system evacuated would be a good time to chuck in a rotary or scroll compressor.
they are half the size and weight so can easily be left in with engine removal and are 100x more efficient.
you'll be amazed how much hp one would free up over that old boat anchor. |
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turboblue
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Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Mon Feb 18, 2013 5:03 pm Post subject: |
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| Joel wrote: |
WHat's made you stick with the old piston compressor?
Surely now while you have the system evacuated would be a good time to chuck in a rotary or scroll compressor.
they are half the size and weight so can easily be left in with engine removal and are 100x more efficient.
you'll be amazed how much hp one would free up over that old boat anchor. |
It's not mine.
It is a customer of mine high school age daughters car.
Budget is a big consideration for her or I would have suggested that.
The engine is back in and running.
I just need a ball park number on the amount of R134a.
We can tweek it from there.
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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GA_Boy
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Joined: October 10, 2006
Posts: 1405
Location: Jefferson, GA
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| Posted: Mon Feb 18, 2013 8:20 pm Post subject: |
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Turboblue, I spent 30 minutes today searching for you an answer and couldn't find one. (I'm retired with nothing better to do.)
You are gonna have to do the Old skool way I'm afraid.
Marvin |
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GA_Boy
Samba Member
Joined: October 10, 2006
Posts: 1405
Location: Jefferson, GA
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| Posted: Mon Feb 18, 2013 8:22 pm Post subject: |
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| Joel wrote: |
WHat's made you stick with the old piston compressor?
Surely now while you have the system evacuated would be a good time to chuck in a rotary or scroll compressor.
they are half the size and weight so can easily be left in with engine removal and are 100x more efficient.
you'll be amazed how much hp one would free up over that old boat anchor. |
I had a hard time finding one with a "V" belt. Most of the new ones use a Serpentine.
Marvin |
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Joel
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Joined: September 04, 2006
Posts: 11099
Location: NSW Australia
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| Posted: Mon Feb 18, 2013 8:41 pm Post subject: |
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You just need to know which ones to look for.
I have a brand new Sanden SD5H09 sitting in the shed for one of my tractors which has a V-belt pulley.
Many compressors are made with V-belt pulleys designed for retrofitting into old cars, sanden do a few different models.
And even most brand new tractors still use V-belts to drive the A/C compressor, they're out there. |
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 33501
Location: Hot Arizona
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| Posted: Mon Feb 18, 2013 9:12 pm Post subject: |
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| GA_Boy wrote: |
| Joel wrote: |
WHat's made you stick with the old piston compressor?
Surely now while you have the system evacuated would be a good time to chuck in a rotary or scroll compressor.
they are half the size and weight so can easily be left in with engine removal and are 100x more efficient.
you'll be amazed how much hp one would free up over that old boat anchor. |
I had a hard time finding one with a "V" belt. Most of the new ones use a Serpentine.
Marvin |
Contact Gilmore Enterprises in Florida for a compressor
My '88 B2200 truck uses a Sanden 708 with a grooved AC clutch.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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turboblue
Samba Member
Joined: October 09, 2003
Posts: 4216
Location: Central Indiana
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| Posted: Tue Feb 19, 2013 10:48 am Post subject: |
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Just got off the phone with a long time old school VW mechanic.
He told me it takes 36 oz. of R12 so at the recommended 80% for the R134a would be about 29 oz.
We are gonna go with that and tweek the pressures when we get it going.
Thanks
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Gary
Turbo VW Sand Drag Buggy
"If you don't run into the Devil every once in awhile, you must be going in the same direction!" |
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