
Originally Posted by
Dr_Snooz
The easiest is to get one of those sniffers from Harbor Freight: https://www.harborfreight.com/electronic-freon-and-halogen-leak-detector-92514.html
You probably spent more on the R12 to fill it than that.
There are a lot of ways though. You can use the dye. I've not have great luck with that and it made a slimy mess of my gauges, but all the 134 seems to have dye in it now. A free way is to look at all your hoses and components for oily stains. Because there's oil and freon in the system, a leak will blow out oil along with the freon. If you see a big greasy stain on one hose, that might be your culprit. You can also take it to a shop and ask them to find the leak (not the mechanic you're using now who can't find it, obviously). That will cost more than the sniffer, and they'll probably be using the same sniffer when they diagnose it.
Also, for the cost of an R12 fill, you can convert over to 134 and lose a few fills before you've spent more money, so definitely do a conversion first. In flushing your system, you might also find your leak.
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