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Will oil added through the suction port on a v-7 compressor hurt it?

bpbxw3 on Tue April 23, 2013 12:55 PM User is offline

Year: 2000
Make: Pontiac
Model: Firebird Trans Am
Engine Size: 5.7L
Refrigerant Type: R-134a
Ambient Temp: 65
Country of Origin: United States

I installed an entire new AC system into my 2000 Pontiac Firebird which included a v-7 compressor that calls for 9oz pag 150 total. I drained all of the shipping oil from the drain plug and added back what drained out (about 5-6oz). I then read online and in the instructions that you're supposed to add oil through the suction port. Worried something might not get oiled I added another 1oz to 1.5oz to the suction port while spinning the compressor by hand with the pulley side down to try an work the oil through. Oil started coming back out of the discharge port so I quit there and put the rest of the 9oz total system fill to the other components in the AC system. After everything was installed I spun the compressor a few more times by hand to be safe.

I'm now worried that I should have only added the oil to the drain plug and that the oil I added through the suction port might hurt the compressor when I have the system vacuumed down and recharged. I don't want to hydro lock it from having too much oil in the wrong places.

Should I remove the compressor, drain it, and start over by filling only the case through the plug?

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Knowledge is the key to success. It's all in who you know.

iceman2555 on Tue April 23, 2013 1:55 PM User is offlineView users profile

Lubricant SHOULD BE ADDED TO THE DRAIN PORT of this compressor. Adding lubricant into the suction port does not allow sufficient lubricant flow to maintain lubricant to the guide rod/guide rod bearing and swash plate bearings.
It is safe to add approximately 4 oz to the drain port (located in case) and the remainder into the accumulator. It is doubtful that the lubricant added to the compressor would represent a serious problem. It is doubtful that this charge into the compressor will harm the compressor. Adding lubricant to the suction port could result in a slight flow restriction...but should not harm the compressor. The system charge amount is more important to maintain lubricant migration thru out the system.
I would be more concerned about the condenser and the method of charging. It is essential that this system be properly charged utilizing the proper equipment. Trying to charge with cans and a perceived pressure will greatly reduce compressor longevity.
This condenser is known for having flow restriction issues when exposed to compressor failures. Strongly suggest to replace the condenser. Also the condenser utilized in this vehicle typically is mounted 'up side down' the discharge (inlet side) is on the bottom and the liquid (outlet side' is mounted on the top side.
If replacing the condenser DO NOT ADD lubricant to the condenser.
Considering the ambient temp expressed in the post...there is a very good chance that residual moistures may remain in your system. 65 degrees does not allow for sufficient heat to completely 'boil' off moisture. Also operational temps will be 'out of spec' due to the lack of heat load on the system. Insure that the system is charged completed.....it was stated the system was charged...how was it charged?
Good luck with your repair.


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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

bpbxw3 on Tue April 23, 2013 2:16 PM User is offline

The system has not been charged yet. I'm taking it to a professional ac shop to do the vacuum and charge. The only parts that arent new are the evaporator and hard lines and those were flushed using approved ac flush and a compressed air powered flushing canister and gun. Then they were blown out with dry shop air. The accumulator, condenser, orifice tube, and compressor are new. I'm just adding the oil and assembling the parts. There currently is exactly 9oz pag 150 in the whole system. There is 5oz in the belly of the compressor through the plug. I added an ounce through the suction port afterward. It's the ounce I added through the suction port I am worried about.

With that said, would you suggest, for maximum efficiency, I remove the compressor and drain it fully to clear out the suction ports and discharge ports, and then refill just case from the plug? Or will the oil eventually work it's way around the system and be ok as it is?

I hope I made this clear. Let me know if anything doesn't make sense.

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Knowledge is the key to success. It's all in who you know.

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