Engine Size: 350
Refrigerant Type: R12
Ambient Temp: ?
Pressure Low: ?
Pressure High: ?
Country of Origin: United States
I have a Harrison 434 mod. 1131434 compressor on my 86 Chevy C-10 Scottsdale pickup truck 350 gas engine with carb.. I am planning on flushing my AC system and cleaning all of the components. I hope yall can tell me how many cylinders are in this compressor and how to drain the oil out of it. I don't know how much oil is in system now and will put a new dryer in and flush the rest. How can I get oil out of compressor while its in truck if possible? Compressor info sticker says system needs 6 oz of oil. Thanks for your time. HIII
R-4 Compressor has four cylinders 90 deg apart running off of a scotch yoke design- No way to drain oil while still mounted to engine. I hope whatever flush you use, you are able to get it all out, I personally do not flush with solvents for this very reason- have seen the damage residual solvent (degreasers) do to a compressor that needs fresh clean lubricant.
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......
To drain the R-4, take it off, ports on back in down position over catch pan, rotate, rotate, let sit overnight, rotate, rotate. Take the OT out and remove the accumulator. Flush the evap and condenser separately. Flush properly, blow-blow-blow to dry well, then dry some more. The wrong flushing solvents, wrong methods, poor drying, and shortcuts; do cause problems.
Thanks I'll try that Monday. HIII
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