The Bosch vane rotary was sold by BEHR and is not a suitable for R-134a retrofit due to elastomer incompatability long range.
Th "gauze" is a absorber for refrigerant oil which seeps past the shaft seal and could initiate clutch slip if not stopped.
hotrodac

All/100% of SD508s are noisy at 2800 compressor rpm. Comp itself is ok. The addition of a aftermarket suction muffler reduces noise 20% and a discharge muffler reduces NVH another 15%. Oil quantity is ZERO influence. Get use to it or swap for a SD7H15 or a swashplate drop in or a SD708 (bracket mods...

Looks a lot like the OEM Sanden SD7H15 with around 100k mi If the clutch friction surfaces wear and the disengaged air gap gets too large, then the flat springs are flexed beyond their safety limit, the springs fatigue and crack. This web site often recommends removing adjustment shims to compensate...

Brad, 10-4 on the 4 cylinder boat anchor Clutch friction surface finish is optimal between smooth and rough. Too smooth is also undesirable. I prefer Iscar cutting mills and lathe, carbide insert, tools from Israel. Gear cutting hobbs (for the anti-rotation gear on a wobble plate compressor) can hav...

Tim,
Please forward my posts and discuss with them OFI (opportunity for improvement) to include a note on amount of lub in crankcase.

hotrodac
"How to Air Condition Your Hot Rod"

Brad, 4-seizen's can't make a silk purse out of a sow's ear (pig's ears are just dog food). The 4 high torque peaks of the R-4 per revolution are not forgiving of border line machining and assembly spec's. DELCO/Harrison design and OEM application are the basic root cause of much of the vibration an...

Tim ol leader of our "band of brothers", My bride of 48 years has a bone to pick with you: The Vistion/Halla Korean knock off you supplied is abnormally cold and in addition I miss knowing for sure that the clutch is engaged because I had become accustomed to hearing the engagements and ru...

Agree with Detroit to disengage compressor shaft from pulley if possible because oil will not circulate w/o refrigerant Many condenser extruded tube designs incorporate a thicker tube wall on the leading edge to prevent rock punctures but you had a really tough bug Clutchless VDC displacement is red...

F-150: Maybe you need a #8 hose at the compressor discharge instead of a #6 (you said) Detroit: welcome back to Tim's band of Brothers. You are long time gone but certainly not forgotten. I also spent too many years in 130 degree (military) hot labs and cactus lands and DV (& jim Baker grade) !s...

If your pressure verses ambient temp relation readings are correct then GM gave your answer for low charge