Thanks Larry,

Yep I have the FSM on the job. Any other 3rd party ones?

My dad actually managed to get hold of 12x12oz cans of R12 so I would love to switch back. I have a sniffer, but I took it to someone else because I just wanted a second confirmation that he couldn't sniff anything in the engine bay either....just to cover any mistakes myself.

Propane OK in place of Nitrogen? That's what I was using before.

The Indy used his sniffer around the expansion valve and said he couldn't get any signs from it. I thought about replacing it first, but if I can't sniff any leaks on it, should be OK?

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2016 Monsoon Gray Audi Allroad - 21k
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2003 Gray Mercedes ML350 - 122k