Filled AC with freon but no compressor oil - SaabCentral Forums
* site search:  
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum

Go Back   SaabCentral Forums > Saab NG900, 1994-1998 and OG9-3, 1999-2002 & '03 Convertible > Saab NG900 & OG9-3 Workshop
Saab NG900 & OG9-3 Workshop Saab NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible Technical Forum

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 2nd June 2011
jcm jcm is offline
Saab Lunatic
 
Join Date: Mar 2011                                                
Location: Detroit area
My Saabs: 04 93, 03 93, 01/95
Posts: 1,090
Default Filled AC with freon but no compressor oil

After installing a new compressor, took the car to a mechanic with proper tools to energize AC system.

Mechanic did not install oil. Compressor clutch did not engage without oil. Mechanic instructed me to fill the low side with oil rather than bring it back to him. I picked up the 3 3oz cans with connection hose. Mechanic said he filled 32 lbs of freon and stated there was "room" for the oil fill.

Q's:

1. Is this a correct procedure?
2. How do I know how much of the can installed by just using a hose without gage?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 2nd June 2011
jakejm79's Avatar
jakejm79 jakejm79 is offline
Saab on the Brain!
 
Join Date: Sep 2010                                                
Location: Southern NH, USA
My Saabs: 1999 9-3 Conv, 2000 9-3 Conv, 2002 9-3
Posts: 5,889
Default

Did the compressor contain any oil when it was installed, most new ones come filled, it is then advised to drain it and add the required amount depending on what you replaced (see below).

Draining of R134a = 20ml
Burst AC Hose = 40ml
Replacement of Hose = 20ml
Replacement of Condenser = 40ml
Replacement of Evaporator = 40ml
Replacement of Expansion Valve = 20ml
Replacement of Compressor = 70ml

I assume if the compressor was the only thing you replaced then you would have to add 90ml (70ml for the compressor and 20ml for the R134a recharge) of oil (~3ozs).
The mechanic added 32Lbs of freon, 1st off 32Lbs wouldn't fit in the system and 2ndly he shouldn't be adding freon at all ng900's and og9-3's took R134a. Do you mean he added refrigerant until the reading was 32PSI???

Anyway to answer your questions:
1. Most definitely not, I suggest taking the vehicle to a trained AC specialist or at least someone that can communicate correctly.
2. By weighing it before and after.
A completely empty system will need 725gs of R134a (~26ozs) and you use the information above to calculate the correct amount of oil.

Also I don't believe that the reason for the clutch not engaging is the lack of oil, while low (if the compressor was drained prior to install) the system should not be completely empty of oil, I suspect that the pressure is not correct and the pressure switches are disabling the compressor from running to prevent damage.
Reply With Quote Quick reply to this message
  #3  
Old 2nd June 2011
jcm jcm is offline
Saab Lunatic
 
Join Date: Mar 2011                                                
Location: Detroit area
My Saabs: 04 93, 03 93, 01/95
Posts: 1,090
Default

Thanks for the reply Jake. He added 134a, ignor my generic freon call-out, until the guage read 32 lbs. I did not install any oil in the empty 40K mile donated compressor, left this to the pro. So there was only oil in the lines.

Shall I install a can of oil and see if the compressor kicks on? This at least will give the answer that I have a functioning unit. If I understand you right, there will be no way to know how much oil is truely in the system without weight. I thought the weight related to 134a not oil.

Perhaps you'll give another shot at guidance.
Reply With Quote Quick reply to this message
  #4  
Old 2nd June 2011
jakejm79's Avatar
jakejm79 jakejm79 is offline
Saab on the Brain!
 
Join Date: Sep 2010                                                
Location: Southern NH, USA
My Saabs: 1999 9-3 Conv, 2000 9-3 Conv, 2002 9-3
Posts: 5,889
Default

Ok no problem on the freon thing, I assumed that was what it was, just wanted to double check, heard many a shop do a funny thing.
You should be good with just one can (3ozs) of the oil based on what was replaced and the compressor being empty that should be enough. If that doesn't solve the clutch not kicking in then I would look at the high and low side pressure readings. While the pressure reading on the low side is used has an estimate for measuring the level of R134a the 'correct' pressure reading can vary depending on outside temp and engine RPM. So it is normally advised to completely empty the system of R134a and then add the correct amount by weight.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
No ACC fault codes, compressor OK, freon OK, AC still doesn't blow cold imola_red Saab 9-5 Workshop 5 16th May 2011 08:58 PM
Low Pressure Port (to ReCharge AC with freon) Mr. Underhill Saab NG900 & OG9-3 Workshop 20 8th August 2010 01:37 PM
Air conditioning freon/oil amounts dmtinker Saab Classic 900 Workshop 13 16th June 2007 05:31 AM
Dupont Freon from the Brazil Division, Bad?? Matt88S Saab Classic 900 Workshop 5 28th July 2006 12:56 AM
filled up with bad gas stamonkey Saab NG900 & OG9-3 Workshop 2 21st May 2006 11:52 AM


All times are GMT -4. The time now is 06:29 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.