| | | 48th NATS by Deathorvictory. December 13th 2019 3:35 pm
| | | | | | | |
Vanning.Com is a an authorized Amsoil Dealer | | | Re: R12 to R134 conversion
[Re: Marcela]
#745053 February 07th 2019 7:27 pm February 07th 2019 7:27 pm |
Joined: Sep 2005 Posts: 8,838 Nuya CatFish
carpal tunnel
|
carpal tunnel
Joined: Sep 2005
Posts: 8,838 Nuya | Marcela, welcome. A system that does not leak R12 can leak R134 like a sieve.... The molecules that make up R134 are much smaller that the molecules that make up R12. These smaller molecules can slowly escape at (usually multiple) locations in the old systems where the (larger) R12 was secure. These leaks may be too tiny to be easily detected and may hold vacuum just fine. Some of the older hoses can actually allow R134 to slowly seep thru the walls of the hose itself. The older the system the more of a problem this becomes. Your '89 would be in that category. As the manufacturers came under fire by the EPA for leaky systems they refined their materials so the later R12 systems were somewhat tighter.
Hope this helps with the background leakage info.
BTW your professional AC tech should know all this ......
Last edited by CatFish; February 07th 2019 7:48 pm. Reason: kant spel
| | | Re: R12 to R134 conversion
[Re: Marcela]
#745054 February 07th 2019 7:47 pm February 07th 2019 7:47 pm |
Joined: Sep 2005 Posts: 8,838 Nuya CatFish
carpal tunnel
|
carpal tunnel
Joined: Sep 2005
Posts: 8,838 Nuya | Changing the system to the later 94/95 system would solve the leakage problem but will not be easy or cheap. The 94/95 is a completely different design. For instance, the new system has a suction accumulator in the low side for excess refrigerant and the older system used a dryer/receiver in the high side. The new system is a orifice metered system and the old system used a thermostatic expansion valve. Long story short ... the entire system (including compressor) will need to swap.
What I would do to save money and work is have all the hoses remade using modern materials, the compressor upgraded and O-rings/connections replaced with R134 compatible types. The R134 will cool using the older design but it will only be about 70 to 80 percent as effective. Still it will save major bucks. Have your evaporator and condenser coils pressure tested to be sure they are leak free as well. My 2%
Last edited by CatFish; February 07th 2019 7:51 pm.
| | | Re: R12 to R134 conversion
[Re: Marcela]
#745063 February 08th 2019 9:05 am February 08th 2019 9:05 am |
Joined: Sep 2013 Posts: 894 Indiana tuner4life
old hand
|
old hand
Joined: Sep 2013
Posts: 894 Indiana | I went through and replaced my 1985's A/C system with all new parts (literally every part). And I'm running R134 through the 1985 spec parts just fine, You just need to make sure to run the correct type of oil, and get the conversion fittings. I wouldn't trust the r134 on original parts however.
Last edited by tuner4life; February 08th 2019 9:13 am.
| | | Re: R12 to R134 conversion
[Re: tuner4life]
#745074 February 08th 2019 3:33 pm February 08th 2019 3:33 pm |
Joined: Feb 2019 Posts: 29 Lawrence, KS USA Marcela OP
newbie
|
OP
newbie
Joined: Feb 2019
Posts: 29 Lawrence, KS USA | I went through and replaced my 1985's A/C system with all new parts (literally every part). And I'm running R134 through the 1985 spec parts just fine, You just need to make sure to run the correct type of oil, and get the conversion fittings. I wouldn't trust the r134 on original parts however. Might end up doing that also and replacing the hoses, especially the long ones to the a/c in the back. | | |
|
0 registered members (),
1
guest and 2
spiders. | Key: Admin,
Global Mod,
Mod | | Forums68 Topics36,648 Posts526,057 Members11,251 | Most Online177 May 8th, 2013 | | |