ocio to disconnect the hose of the vapors... I think so? do not put negative pressure on the block... what ? good thing ? right...
risks of leaks are the worst if not worse...
use a decanter in series on the line, rather than a disconnection in total.
the heat exchanger you have it deleted ? if s? as you have bypassed the circuit of the liquid ? I have bent an aluminum tube cos? to fake it...