Put oil in empty 911 AC

[Nick Triesch]

System is empty in my 85 911 after some repair work. Started car, put AC on high opened can but did not seem to want to empty can. Blockage in expansion valve maybe ? System was leaking for some time with a torn hose under the car. Does the oil always suck right in?

[walt]

So this is a can of refrigerant with the oil mixed in? If the system is empty you would normally pour oil directly into the compressor.

[r lane]

IF everything is working correctly, yes. I hate AC work and I really hated never knowing if you have enough oil in the system. In your case, if you know it is empty, fill it according to spec with the oil, bypass the oil injection, pull a vacuum and begin a charge. Might want to install a dryer first if the system has been dormant for some time

[87maniac]

Is the system truly empty ?
Is the compressor turning, or only the clutch?

was the compressor removed and drained of all oil?
- or is it 'empty' of refrigerant?

There will be residual oil in the system if the lines were not flushed
and compressor not removed and flushed.

[GH85Carrera]

Has the system been open for some time?

Add a few oz to the evaporator, and whatever the proper amount is to the compressor. You will need to pull a long vacuum. I usually suck it down, and leave it overnight. then I pressurize it with dry nitrogen to 200 lbs and check for leaks. Then pull another multi hour vacuum again.

Factory stock the AC system had no pressure stitch. If your car has been updated it may have one. You may have to jumper the wires to get the compressor to run. Add the refrigerant until the pressures are proper on the low and high side. That will depend on the temperature outside. And do it with the engine lid down.

[86 911 Targa]

Nick,

pm me as needed.

I completely rebuilt the A/C on our '86.

Kuehl was very helpful.

DO NOT RUN YOUR A/C WITHOUT REFRIGERANT!!!

[Nick Triesch]

Thanks for all the input. Got my system working again. At some time when my car was on a lift , both rubber AC lines were pinched causing leaks. Both sides. I repaired both sides with hose menders and checked for leaks . Did vacuum. Good. Added ingredients and it works. Two years ago I replaced compressor, expansion valve , dryer , and thermostat. I cannot go the Kuel route now because late last year I had top end , clutch and flywheel and sensors replaced. So this AC will have to do for now. At any rate, 46 degrees at the vents. It is a converted 134 A system. So, in short, AC hoses can be repaired. Thanks, nick.

[87maniac]

what did you use to repair the leaky hoses?

[Nick Triesch]

Solid brass barbed hose menders with the barbs on both sides. I used a few different sizes because the right and left long hoses are different. Also, I needed to replace a small piece of hose that was too damaged with a small section of hose that I bought from an auto parts store. So in short, I just cut out and spliced the hoses back together. Before you think it will not work , the barbed hose menders make a good seal with the hose clamps. Google brass hose menders and you will see them. If you are lucky , you will still have enough hose that you will not have to add another section.

[Nick Triesch]

Mom and pop hardware stores will have many sizes of the brass hose menders . Will need hose clamps.