Charging Dash A/C
My dash A/C works great although it will lose some R-134A over several months time. I added a can and a half about four months ago (hose with vale and gauge from auto store). I noted at the time that ...
Forum Discussion
Without knowing what kind of system we're talking about, and where the gauge is being connected, hard to say what a reading should be.
It won't cool if overfull with refrigerant, Just ahead of the expansion device, the low side pressure ought to be in low-to-mid 20's. But I wouldn't put mich trust in a cheap gauge or the advice of a sales person at most auto supply outlets.
If it's a good gauge, properly connected, a fluctuating low side reading can be moisture in the system, freezing at the expansion device, then melting or breaking up to allow flow to continue.
It won't cool if overfull with refrigerant, Just ahead of the expansion device, the low side pressure ought to be in low-to-mid 20's. But I wouldn't put mich trust in a cheap gauge or the advice of a sales person at most auto supply outlets.
If it's a good gauge, properly connected, a fluctuating low side reading can be moisture in the system, freezing at the expansion device, then melting or breaking up to allow flow to continue.
