Quote:
Originally Posted by donbryce
The compressor ports are marked 'D' and 'S', which I assume is 'discharge' and 'suction'. I have a conversion kit, from R12 to 134A, and it has adaptors for the shrader valves, marked 'H' and 'L', which I assume is 'high' and 'low'. Which is the high side, the discharge or the suction? (I know next to nada about A/C) 
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Before you switch from r12 to 134a read all of Larry Bibles A/C threads.Use SEARCH.