Well .. thanks for the info on the vaccuum amount and source .
You indicate it can't be a hand vac, and that it must be 30 in per # maintained for 30 minutes and that the system must hold this otherwise there is a leak. And if there is a leak, the way to detect it (this info you didn't provide in your latest post) is :
1) air pressure and a sniffer ( Expensive shop equipment)
2) UV dye added to R134A and a UV LED pen light ( DIY cheap
method to get by for most larger leaks )
I understand the hand vac is not a 3/4 horse motor with reciprocating piston and valve so the vacuum amount is less, but none-the-less , it is vaccuum and some must be better than none.
Well when I did hook up the mity-vac, it did hold the 25psi for like 20 min.. I left it and when I came back it was the same vaccuum, so I imagine it heald on the low side.
But you didn't mention anything about using the low side in favor of the high side schraeder valve .... or what is it exactly that the occasion arrises to use the high side port for ?
You check the pressure differentials between the 2 to see if they are according to spec ?_
I have heard people talking about 'pulling ' the stuff
f through with vaccuum.. is this what u do to fill the system with the engine off is apply vaccuum at the high side and open a can of R134A applied to the low side ?
