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Dual Air Suburban oil charge in components

zzljg on Sat July 11, 2009 2:25 PM User is offline

Year: 95
Make: Chevy
Model: Suburban

R134a system with R4 compressor,system cleaned and flushed,, new accumulator & orifice,,complete oil charge is 11 oz,,I understand the the compressor oil charge is 7-8 oz,,, is this amount added to the suction side ? and balance divided up in the comonents,,,just want to make sure this is correct , it just seems like a lot of oil in the pump to start with,,,any advice on this will be appreciated


Chick on Sat July 11, 2009 7:27 PM User is offlineView users profile

Put about four ounces in the compressor, some may spill out if to much is added, the rest in the accumulator..It will get to the compressor with the refrigerant as you're charging it.. ... Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

GM Tech on Sat July 11, 2009 10:29 PM User is offline

May seem like a lot of oil in the pump to start with-- but every car assembly plant has the entire system oil charge in the compressor at vehicle start.. So your suburban started its life with all the oil in the what is one more time? no big deal- relax- it won't hurt anything. ..(one exception is dual systems the assem plant adds the 3 extra ounces in the high side charge port)

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......

zzljg on Sun July 12, 2009 9:29 AM User is offline

Thanks to all for the great info posted on this site,,,I have background in A/C work but nothing in auto field,,It's a field all of it's own and I have a lot of respect for those who work on the systems and take the time to post and contribute their knowledge here,,,,,I'm sure my system would not have lasted very long without it

Thanks Again

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