Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Compressor Failure and replacement

Halefleender on Thu August 06, 2009 7:44 PM User is offlineView users profile

Year: 1987
Make: Ford
Model: F-350
Engine Size: 460
Refrigerant Type: R134a
Ambient Temp: 109
Country of Origin: United States

Glad I found this site, thanks to the Ford Forums!

Hi guys,

I had the clutch go out on my compressor, but due to the warranty I chose to replace the entire compressor. Now that I am too far into it, I should have just replaced the clutch and not opened the system up. I was blowing nice and cold! So the new compressor didn't come with the paperwork that the old one did and It doesn't tell me how much oil to add. I am not replacing the dryer or any other component as they are less than a year old.

The guys at O'reillys/Checker told me that it should take 3.5 ounces for every lb of refrigerant. My truck calls for 48oz or 3lbs of R12. I converted it to R134a last year and am not sure if the numbers cross over, doesn't the R134a use higher pressure and cause for less oil? And he couldn't tell me how much to put in if I am only replacing the compressor. I didn't catch anything that came out when I cracked the line?

I have to state that when I installed the unit last year I did not evac the system, however, it was working fine until the clutch went out. I have read that not evacuating could cause failure in a week, not a year. Do any of you think that not evacuating the system caused the clutch to fail? I don't want to repeat the installation if it was not correct and caused this failure even if it did take a year!

So questions are:

1. How much oil to put in the system before I seal it up?
2. How much R134a to put in once its running?
3. Do I have to evac the system? (its 109 with very low humidity in Arizona and I didn't do it last time?)
4. Kind of related---Although its cold, it doesn't blow with enough force to cool down the entire cab. Is there something I should be looking at or is the factory blower just not strong enough for the task?

Thanks for any advice!

P.S. It's an F6 compressor







-------------------------
1987 Ford F-350 4x4 Super Crew Cab 460 carbed.

Edited: Thu August 06, 2009 at 7:50 PM by Halefleender

Prospeeder on Thu August 06, 2009 11:14 PM User is offlineView users profile

Thats alot of oil, you probable only needed around 2 oz of oil added to the system, there was still alot in the evap and condensor. Too much oil will cause the system to run less efficent, and not very cold. I would try to remove some oil if you put in. are you making sure the clutch is shimmed correctly? Possibly just another defective unit, reman? I hear most remans are junk. Does the clutch just not engauge or does it slip?

-------------------------
1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

TRB on Fri August 07, 2009 9:50 AM User is offlineView users profile

This system takes 9 to 10 ounces of oil max. So if you did not flush the old oil out of the system it's only a guess as to how much to add back. My guess would be 2 ounces for the compressor and 2 ounces for the accumulator if replaced. Adding too much oil to a system will cause it not to cool correctly.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

Halefleender on Fri August 07, 2009 4:49 PM User is offlineView users profile

Thanks guys,

If I flush the system with an agent and compressed air, will that remove all the oil? That way I now that puttng in 9 wouldn't be too much?

Thanks,

Paul

-------------------------
1987 Ford F-350 4x4 Super Crew Cab 460 carbed.

TRB on Fri August 07, 2009 5:35 PM User is offlineView users profile

Follow Hecat's Flushing Technique and you will have no issue if the flushing procedure. Anything less can lead to poor results and failure of the new components.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.