2020-B1-7

Author Topic: A/C system running r134a help  (Read 160 times)

nigel

  • Active Forum Member
  • *
  • Posts: 283
A/C system running r134a help
« on: February 08, 2020, 03:04:25 PM »
Help please rebuilt the A/c system in the t/a cleaned and flushed both evaporator and condenser, new a6 compressor fitted with new hard and flexible lines.
Drained the oil out of the compressor as per information from compressor manufacture and refilled with PAG150 oil 8oz but not sure if it should have 12oz in the system as it will be running R134a any advice would be great thank you.

JJ 109

  • Active Forum Member
  • *
  • Posts: 182
Re: A/C system running r134a help
« Reply #1 on: February 08, 2020, 07:46:26 PM »
The compressor manufacturer said 8 so where is 12 coming from?

However, error on the side of too much rather than not enough.

If you under fill you will burn up compressor.

If you have too much oil you will just lose a little AC performance under very high loads.
JJ
76 pro tour project
Twin Turbo LS1
Detroit

nigel

  • Active Forum Member
  • *
  • Posts: 283
Re: A/C system running r134a help
« Reply #2 on: February 09, 2020, 04:03:00 AM »
Read in one of the manuals that should have 12oz of oil running r12 refrigerant is that the same for r134a I don't want to burnout the compressor but also overfilling is not recommended. 

JJ 109

  • Active Forum Member
  • *
  • Posts: 182
Re: A/C system running r134a help
« Reply #3 on: February 09, 2020, 09:13:02 AM »
Is the compressor manufacturer specifying the amount specific to your car, or is that a generic value?  If they have done oil circulation studies on your model then use that value.

Otherwise lean towards the original value.

I can tell you both are a lot of oil compared to today’s standard which are closer to 5.

Although we don’t have big accumulators like these cars had.
JJ
76 pro tour project
Twin Turbo LS1
Detroit

cyber104

  • Active Forum Member
  • *
  • Posts: 778
Re: A/C system running r134a help
« Reply #4 on: February 09, 2020, 09:59:49 AM »
If it helps - the most I could get into my original A6 after completely draining it was about 8oz.

I then introduced 2 more oz of oil with R12.

I would think the same applies to r134 - but I'm not positive

Chris
1978 TA 4-Speed W72

Wallington

  • Active Forum Member
  • *
  • Posts: 221
Re: A/C system running r134a help
« Reply #5 on: February 12, 2020, 01:06:44 AM »
The oil can be added via the compressor sump, the rest in the system with the refrigerant where it ends up anyway.

Re: A/C system running r134a help
« Reply #5 on: February 12, 2020, 01:06:44 AM »
You can help support TAC!

 



2020-B1-4