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Chevy C20 ..new system ...oil amount?

brimac50 on Fri August 09, 2013 4:27 PM User is offline

Year: 1980
Make: Chevrolet
Model: C20
Engine Size: 350
Refrigerant Type: R-12
Country of Origin: United States

This is a new system. I'v replaced the evaporator, condenser, accumulator, hoses, and compressor. I'm using a Sanden SD5H14, ... and sticking with R-12, since I already have an ample supply. And of course, using mineral oil. These hoses might be a bit longer than OEM's, because of how they were routed. According to my 1980 GMC Light Duty Trucks service manual, ....total system oil required is 6 fluid ounces. I'll drain the PAG oil from the new Sanden, and replace that amount with mineral oil, after flushing it with mineral oil. Doing that, along with adding 3 ounces to the evaporator and 1 ounce to the condenser, is my plan. System will be properly evacuated and charged by weight, .... which is 3 lbs 12 ounces, as noted in the manual. Do the oil amounts / locations sound right? Have I overlooked anything here? Any suggestions or corrections to this scenario is appreciated. Thanks

GM Tech on Fri August 09, 2013 4:49 PM User is offline

I always put all the required system oil in the compressor- just as it was done when the car was first started on the assembly line. Why fool around trying to fill different parts..?

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

brimac50 on Fri August 09, 2013 10:38 PM User is offline

Quote
Originally posted by: GM Tech
I always put all the required system oil in the compressor- just as it was done when the car was first started on the assembly line. Why fool around trying to fill different parts..?

I just took another look at the GM manual. It does not list the total amount of oil, originally put in the system, at the factory. That's what I need to find out. It only specs how much to add per specific component replaced. And, since I'm not using the original style compressor, I tend to be cautious, concerning "spreading out the oil", with a "never before run", not yet -oiled "dry" system. The hoses have not yet had their final install, so ... it's easy to add oil at various locations.

wptski on Fri August 09, 2013 11:03 PM User is offline

Putting all the oil in the compressor may have one issue that I found out. Oil was add and ports were plugged to allow the install without losing the oil. The position of the ports after it was bolted in allowed oil to leak out when the plug were removed. That may work but not in all vehicles.

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