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I do not believe in using dye.
It has the potential for clogging up all sorts of small things...
AND more importantly does not help with leaks on the top of lines or in the evaporator area.... so there are too many downsides for me to put the stuff into my system.
The Nitrogen is for a four oz shot of R22 for leak checking and also for propelling the flush through the system... .... I do not expect any leaks since I will be taking the entire system down and flushing, putting nylog on correct seals, using two wrenches for each holding job where called for, new compressor, etc..
But believe in checking the system in the pressurized condition before checking in the vacuum condition.
HF sells them for under $100 ? I am getting mine AND it shipped to me for a TOTAL of $35.
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