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Too much oil

joe45 on Wed March 25, 2009 2:32 PM User is offline

Year: 1996
Make: chevy
Model: k1500
Engine Size: 5.7L
Refrigerant Type: R134a
Ambient Temp: 70
Pressure Low: na
Pressure High: na
Country of Origin: United States

I have a 96 Z71 pick up that I replaced the condenser coil in because of at leak. When I removed the lines from the old condenser coil I destroyed the threads because they were corroded and aluminum but since I had a new condenser I didn’t care. The problem was the aluminum was caught in the threads of the AC lines going to the condenser coil. I removed all the lines including the ones going to the evaporator. I kind of ran in to the same problem at the evaporator but I did not destroy all the threads.

I blew out all the lines with and air compressor and drained all the oil out of them. I didn’t flush them with any solvents because I did not have a compressor fail or anything so the system was pretty clean. Due to my inexperience with the compressor clutch removal (clutch was bad) puller I damaged the compressor and had to replace it with one from a junk yard.

Now putting all of this stuff back together I replaced all the O-rings with green ones and carefully cleaned out the threads of the lines and replaced the Accumulator with a new one. I never drained or primed the junk yard compressor with oil (didn’t know at the time that I had too) prior to installing but I did notice some oil spilled out when I had it on the bench.

After everything was installed I used a venturi vacuum on it for a hour and half and it seemed to hold vacuum. I then added the correct oil (via two small 4oz pressurized cans) called out by the sticker on the compressor and two 12oz cans of r134a. Testing the system the air coming out of the vents only got cool but not cold. Fearing I put to much oil in the system I stopped and bled off some of the pressure and haven’t touched it since.

Is it possible I put to much oil in or there was to much left in the compressor? Another thing too I never changed the orifice tube because I didn’t know where it was. Should I just vac it down and start over? Help please!

robs on Wed March 25, 2009 3:52 PM User is offlineView users profile

Let me first start by informing you of your vehicles A/C specifications. Your system takes a total of 8 oz of compressor oil PAG 150 and a total of 32oz of 134a refrigerant or 36oz if its a crew cab. Now with that being said, that's the specification for a system that has been pretty much replaced with all new components or components that have been properly flushed and are debris free or oil free. Now its hard to determine how much oil you put in the system if the compressor was not drained of all its oil and measured. The same can be said about the refrigerant, you added 24oz, which is less of its capacity, so i don't know how you determined that 24oz would be enough without knowing how much you had left in the system.
This is what i would recommend and unfortunately we would have to start at ground zero. You would first need to properly reclaim the refrigerant you have left in the system. Next, you would have to take the system apart and properly flush out all the components again. To read on how you can properly flush out your system, please click HERE. That topic has affordable flushing equipment or the more expensive, but professional quality equipment as well. Now since the condenser is non flush able, i recommend just blowing it out with just air. I would not normally recommend doing that, but since the system wasn't ran for too long, you can probably get away with it. You will have to also replace the DRIER once again and the ORIFICE TUBE which should be located in the condenser, where it meets the liquid line. As far as the compressor goes, you will need to drain it of all its oil. Buy two 8oz of PAG 150 , one to flush and drain the compressor with and the other to use back into your system. Now you only want to add 6 oz to the compressor once it has been flushed and drained. The left over 2 ounces you want to add to your drier prior of installation. That is pretty much what i would recommend to do. All that would be left would be to install everything back together, vacuum the system down and add the proper amount of refrigerant back into the system.

Edited: Wed March 25, 2009 at 4:57 PM by robs

joe45 on Wed March 25, 2009 3:58 PM User is offline

I wonder if there is no orfice tube in it at all? The condenser coil was brand new does that mean its already has one installed?

mk378 on Wed March 25, 2009 4:22 PM User is offline

The orifice tube should be in the truck line leaving the bottom of the condenser. There are 3 dents in the side of the pipe about 3 inches downstream of the fitting to stop the tube from going too far. If you disconnect it you should see the plastic end of the tube in the fitting. You can grab it with pliers and pull it out. If you replaced that line with a new one due to damaged threads, it probably did not come with an OT already in it.

The wily engineers at GM had set up a lot of these systems with more than one place to install an OT. It is always going to be somewhere between the condenser and evaporator. You need to be sure the vehicle has one and only one OT in it.

joe45 on Wed March 25, 2009 4:28 PM User is offline

OK thanks, I'm pretty sure thats the missing link. Thanks guys this forum rocks!

70monte on Fri March 27, 2009 6:14 PM User is offline

I bought a new condensor for my 98 chevy truck when I fixed the air two years ago and it already had a new orifice tube installed in the pipe.


joe45 on Tue May 26, 2009 10:14 AM User is offline

That was it no orfice tube.

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