<>

BS.. what do you think a sight glass is for ??
I have been doing refrigeration for years and years...There is no mis-guidance here.
As a matter of fact , the misguidance on this post was right from the get-go He was told he needed a new hose for an unseated high side valve..but a quick tap to seat of the valve fixed that right off, like they always do..then he was told he needed a high pressure sw ..well, the old sight glass and a little info from this Forum took care off that, too..[ I have seen only two bad switches in all time ..one had a leak and the other was shorted closed , resulting in constant fan]
Any working A/C Tech will tell you on a "no low fan complaint" that if the fan works when the sw is jumpered , the most likely problem is low refrigerant..not the sw. Take note that I said "Most Likely"..
So, we solved this little birds nest of problems quite easily with some common sense and very little $$$$. So forget about Misguidance ..if anything..Excellent guidance would be more appropriate..
Topping off a system with the aid of the sight-glass is perfectly acceptable .
..and if you re-read any of my post , you will see that I mention gauges as being the best bet, so I am not giving eyesight preference..I am just giving good info of the variable ways it can be done considering ones circumstances..Not Misguidance my friend, that's for sure..