Heads up for UK buyers looking for 150MHz 4 channel scope, this one just appeared in my search box on Shpock, its in Redditch though, £150 or offer
https://www.shpock.com/en-gb/i/YPFCBgUNjGp9c4Xa/tektronix-2445a-4-channel-150mhz-oscilloscope
That’s a pretty good deal actually
Would be tempted if my air con wasn’t bust
I thought it was a good deal, almost went for it myself as its a 4 channel unit. Maybe your Air Con just needs a recharge? If so its around the £40 mark and is so much better than driving with the windows open, which cause drag, buffeting, popped ear drums and of course a far bigger hike in fuel bills than powering the AC costs.
Unfortunately it requires HFO-1234yf which is considerably more expensive. I don't drive it enough to bother fixing it properly.
Fix it or else you really do run the risk of having the compressor locking up and that will seriously ruin your day and hurt your wallet big time.
Even if the system lost all it's refrigerant as long as there is sufficient compressor oil in the system, no moisture, and you don't run it I can't see the compressor itself being damaged. The compressor does not turn unless the compressor clutch is engaged, unless French cars are weird which wouldn't surprise me.
Eeeehhh... this was true back in the days of R12. Even when I was working with R134 decades ago, an AC system that we could not confirm hadn't been exposed to air was considered "a warranty risk" due to the nature of the refrigerant, the additives, and the lubricants involved, which become corrosive when moisture from the air is introduced to the system.
Dealership garage I worked at refused to provide warranty on any such AC work unless compressor, evap, orifice tube if not expansion valve, and receiver/dryer and/or accumulator were replaced after a complete flush of the remaining system, due to the potential for return problems.
Things change man. They get 10x the cooling out of 1/4 the refrigerant nowadays; the machinery runs a lot harder, but also a lot more advanced chemistry, which does not like being contaminated.
mnem