You know how turning the A/C compressor on raises the RPM needle a couple hundred up. But with mine it's a little weird. When the vehicle isn't moving and at idle, turning the A/C on does not do anything to the RPM. Only when I push on the throttle, drive forward and settle down to idle, then can I see the base RPM is increased as it should. So theoretically, if I turn the A/C on at idle and just stay there for an hour, the compressor would be running without loading the engine for all that time. Or I have to manually throttle it and increase the RPM once to raise the base RPM with the A/C on.

Is this supposed to be normal? Does anybody else experience this?