Correct Just the hose and dryer and orifice
I'm getting into a gray area here, I've rarely (4-5 times) had to re-balance a system's oil. Usually I start "from clean". But,...
Let's keep in mind the system's target oil capacity is 8oz. I assume you had a proper 8oz oil charge prior to the uncontrolled blowdown.
From the GM document I posted above:
- add 3oz to backfill for the oil lost due to uncontrolled blowdown
- add 3.5oz of oil to replace that in the receiver / dryer (to make up for the oil coating the desiccant and the inside of the canister)
At this point, the suggested addition of oil is 6.5oz... only 1.5oz short of a full charge
So let's now consider the oil which might be resident in the other components.
The same GM document suggests that 3oz might be resident in the evaporator. Adding that to the 6.5oz from above yieilds 9.5oz. OK, that's over the 8oz target, but better a little over than under IMHO.
You might drain the compressor just to see how much is in it, but if it was running at the time of the blowdown (which I assume was the case) there's probably not a lot within (the HT6 doesn't have a "sump", so guessing 1.5-2oz of oil remains based on information I have from Sanden; see the picture below).
Net-net from me: Follow the two steps given above (add 3oz plus another 3.5oz to the system). I would put it ALL in the receiver / dryer so it's close to the compressor, i.e., it will reach the compressor soon after start up. Alternatively, you could split the additions, i.e,. 3.5oz in the R/D and 3oz added to whatever's in the compressor (pour it in the suction port, then turn the compressor by hand 10 times to circulate the oil around a bit so it doesn't hydrolock when you first re-start it).
That's my $0.02.
@PlayingWithTBI and @L31MaxExpress, to name but two, might weigh-in here. They speak well when it comes to AC.
NOTE:
Here's a snippet from the Sanden SD Compressor Service Guide V2 which gives some insight into the expected oil amounts to find resident in the compressor, based on compressor RPM (on a GMT400, the compressor turns at about 1.5x engine RPM, assuming an 8" crank pulley and a 5.2" compressor pulley). Find the details yourself in the Sanden document (attached as a .pdf).
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