OK, spent another half hour or so fiddling with this. I have one of those all in one trigger rechargers with the pressure meter on top. With the A/C "on," not in EC mode, I see almost no pressure when trying to recharge. When I switch it back to EC, I'm getting significantly more pressure in the line. Even appears as "charged" at that point, and I can feel pressure from the valve when I engage/disengage the charge connector.
Why would the line be more pressurized with the A/C off and drop when the compressor is supposed to be on? Symptom of a bum compressor?
When switching A/C, I can hear what sounds like a "click" under the hood, and I check the pressure, and it drops considerably and doesn't appear to be "taking" the charge.
Sure is hot today!
-Chuck