New the forum. I hope my question is not too simple but perhaps other newbies will find the discussion useful.
1999 Chevrolet Blazer, 4.3L, doing major repair and replacement of parts on AC system.
Parts replaced or to be replaced:
Lines to compressor of which one has a built-in muffler,
- Evaporator and
* Compressor is a GPD Sanden style (GPD pn 6512124) which is a functional replacement for the original equipment style GM calls an HT6.
Question: With my system now with no oil, how do I determine the total amount of oil to add?
The label on the side of the original compressor states that the oil capacity 8.0 oz with the official GM manual stating that the total amount of oil for the system is also 8.0 oz. The label on the side of the new compressor states that the amount of oil is 6.4 oz. Am I correct to assume that the oil amount identified on the compressor labels is the total amount of oil that should be in the system when using the corresponding compressor? I.e. With the new compressor, the total amount of oil for the whole system should be 6.4 oz and not the 8.0 called for in the manual and that is listed on the original compressor?
I can see how with a different compressor design, less oil could be needed although it seems odd that the specification for the new compressor would be for the same amount of oil irrespective of the particular system. Then again, the original compressor was likely used on many GM vehicles all with only slight differences in their system components/geometry.
Finally, for whatever total amount of oil I should put into the system, should it all go into the compressor? If not, where else should I put some of the oil? My system is not one with a second evaporator so there are no extra components besides the main system.