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

Help with first time repair

Boss Hogg on Fri July 23, 2010 11:06 AM User is offline

Year: 1995
Make: Ford
Model: Mustang GT
Engine Size: 302 ci
Refrigerant Type: R134a
Ambient Temp: 90
Pressure Low: 42
Pressure High: 145
Country of Origin: United States

I just replaced my compressor f10, complete manifold w/hose set. Receiver dryer, liquid line. I flushed out the condenser with dura flush II, replaced all the Orings. Added 7 oz of dec pag46 5 oz to the compressor 1 oz each to the condenser and evaporator. Vacuum the system down to 30 and for about 2 hours stopped the pump closed the valves waited 1 hour with no change in vacuum. Hooked up the R134a refrigerant to the yellow line and started filling the system. All went well I added 3 cans less 2 oz or 34 oz
134a to the system and the air was really cold. I shut off the a/c and was putting away the vacuum pump and tools.
All of a sudden there was a loud pop and a loud hissing spraying a fog out of what I found out was a improperly seated liquid line at the evaporator. I recall it looked crooked but I had pulled real hard and it would not come off by hand. I immediately plugged the liquid line back in and heard a resounding CLICK.

The next day I searched the web to see if there was a way to determine how much oil I had lost to this sudden loss of freon. I finally decided that it needed 3 oz of dec pag 46 so I went out and bought an oil injector and pulled a vacuum for 2 hours then attached the injectors to the manifold line it pulled the 3 oz in. I then pulled a vacuum for an additional hour and cut off valves and no loss of vacuum after 1 hr. Started filling the system again with 34oz of 134a. The air did not seem to be as cold as the first time before the line blew off. I checked the pressures and they were high 143 low 42, 92 f outside temp . Also it seems to cool ok when moving but under acceleration it sometimes goes almost to warm air intermittently. and sometime when stopped it feels like the air is not as cold but not always. I am going to get a vent thermometer today and check the center vent temp.

Whew That was long.

Now after finding this forum last night and reading for about four hours I think I now see some things I may have done wrong.
First I think I added too much pag oil after the blow out ? Secondly I did not purge the lines after hooking up the freon, or before injecting the oil ?
Would letting that much air back in cause these symptoms? What would be the best course of action to take to try and resolve the problems with the system not cooling enough. Evacuate and vacuum and recharge? How do I get the excess oil out of the system?

Thanks for any advice or direction you can give.

-------------------------
Boy that can sure did take off!

Edited: Sat July 24, 2010 at 12:58 PM by Boss Hogg

Kenny on Sat July 24, 2010 8:25 AM User is offline

You need to take off the compressor and dump the oil completely out, then refill it with the correct amount.

Boss Hogg on Sat July 24, 2010 9:27 AM User is offline

Thanks for the advice.
How do I know how much oil to put back in? I thought there would be some oil still in condenser,evaporator,dryer and hoses. I guess that is not enough to worry about.
I will do as you suggest pull the compressor drain the oil and refill with 7 oz dec PAG oil.

Thanks again for the advice.

-------------------------
Boy that can sure did take off!

Edited: Sat July 24, 2010 at 12:58 PM by Boss Hogg

Boss Hogg on Sat July 24, 2010 12:57 PM User is offline

Ok evacuated removed the compressor dumped out the oil added 7 oz back in changed the manifold orings and reinstalled. I have it pulling a vacuum now. I will post results after recharge tonight.
Thanks again for the advice.

Boss

-------------------------
Boy that can sure did take off!

Edited: Sat July 24, 2010 at 1:02 PM by Boss Hogg

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.