Don't mean to hijack but I just wrapped up my Kuehl install last week - did it myself except for the evacuation and charging. Temperature the day it was charged wasn't too warm (just under 80) so I've yet to see how it does when it gets really warm, but this was a pretty good sign (crap picture but it's showing about 34 degrees)....
Two thumbs up for Griffiths - excellent product and great service (lots of patience with my noobie questions).
And since my '82 didn't have any markings for the A/C controls, I came up with my own 
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Richard
1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, RarlyL8 headers & single out muffler, SC cams, TK I/C
2018 GTi, 2020 AMG E53 wagon ski car
2004 BMW R1100S
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