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I do know 134 is hard to detect. I haven't even begun to get the stuff to add the fitting for refrigerant so I will be checking to see what is going to be most effective. I also have some R12 replacement that is not freon but is propane based (I should have said hydrocarbon based). If the sniffer will pick that up I may use that. I think that will leave the system at 70 PSI at normal ambient temps. I have more homework to do.
If I do use the R12 replacement it has that distinctive propane odor and if that gets me in the area of the leak just by using my nose I am much further ahead than I am now.
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There is a portable UV lamp made by Interdynamics (probably others too) that can be used to spot A/C leaks - it runs around $50 and can be bought almost anywhere.
