Re: [MBZ] DIY AC repair in modern times

[Peter Frederick]

I use a GowMac thermal conductivity leak detector I picked up on eBay 
for $35 -- they run $3500 or so new.  Very sensitive, but use with 
caution with flamables, they use a heated platinum wire as a detection 
device.  It actually compares the heat conducting ability of a sample 
of air pulled through a probe to the heat conducting ability of the 
environmental air.  Work great except you have to watch a needle (old 
style, the newer ones click too) and cold, wet air gives a good signal, 
just the opposite of Freon!

Peter