Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

AC Compressor

Thread Tools
 
Search this Thread
 
Old 05-31-2015, 08:16 PM
  #16  
Ducman82
 
Ducman82's Avatar
 
Join Date: Nov 2009
Location: Marysville WA
Posts: 6,983
Received 18 Likes on 11 Posts
Default

Odd being they have no idea what oil you have in your system, and mixing is a no no
Old 05-31-2015, 11:03 PM
  #17  
The Forgotten On
Rennlist Member
 
The Forgotten On's Avatar
 
Join Date: May 2012
Location: Thousand Oaks California
Posts: 4,964
Received 316 Likes on 263 Posts
Default

You can mix ester oils, just not PAG. Otherwise you will have a sludgy mess that will destroy the compressor.

As usual, do a chemical flush of all of the lines first to remove any lingering oils from the previous charge.
Old 06-01-2015, 08:58 AM
  #18  
WallyP

Rennlist Member
Rennlist Site Sponsor

 
WallyP's Avatar
 
Join Date: Jun 2001
Location: Acworth, GA
Posts: 6,469
Likes: 0
Received 11 Likes on 11 Posts
Default

The reason for using POE oil is that it will tolerate small amounts of residual mineral oil.

PAG is a better oil, but will not tolerate any residual mineral oil. R-134a does not play well with mineral oil.
Old 06-01-2015, 10:03 AM
  #19  
bureau13
Rennlist Member
 
bureau13's Avatar
 
Join Date: May 2014
Location: South Florida
Posts: 3,478
Received 55 Likes on 42 Posts
Default

I didn't think it was so odd, given that I requested a compressor for R12. So Roger knew what type of system it was going into, at least. I don't know if they would have given him one with POE or PAG oil had I said R134a, or one that was empty.
Old 06-02-2015, 08:36 AM
  #20  
drooman
Rennlist Member
 
drooman's Avatar
 
Join Date: Jun 2011
Location: CT & FL
Posts: 2,767
Received 2,077 Likes on 716 Posts
Default

The only way to be sure about oil types/quantities is to flush out the entire system with AC flush..every line and component. Then drain AND hand pump the new/ reman compressor as dry as you can (you'll get most of it out) then oil charge the system with the correct quantity of oil. Most compressor re-fits and 134a conversions I've torn into have too much oil built up in them from various compressor swaps over the years...too much oil means higher vent temps, and too little means a short compressor life.
Old 06-02-2015, 09:04 AM
  #21  
griffiths
Rennlist Member
 
griffiths's Avatar
 
Join Date: Jun 2004
Posts: 1,056
Received 48 Likes on 37 Posts
Default

Most of the 'oil' issues are a result of poor or lacking service documentation, especially when a vehicle has gone through numerous owner's and service facilities. +1 on the 'if in doubt, flush it'.

When a vehicle is converted to R134a a blue R134a conversion sticker should be placed near the service area (engine compartment) which details the type of oil used, and the work/repair order should be noted as well (ie. amount and type of oil, amount of refrigerant). However, many techs and DIY's are either not familiar with this or simply fail to do it.

For the past 20 years of providing R134a conversion kits and systems we have always provided the requisite R134a conversion label and note in the procedural instructions to document everything: evacuation process, oil type and amount, refrigerant amount, pressures and temperatures. Having that data comes in very handy while troubleshooting system issues.



Quick Reply: AC Compressor



All times are GMT -3. The time now is 12:37 AM.