Front left? Check the tightness of the radiator drain screw, bottom left side of radiator.

The AC, check that the wheel in the center dash vent is rolled to full Blue Dots...if it isn't, you will not get full cold. Run that dial in red dots for heater, blue dots for AC. Only took me a few years to figure that one out.

The dealer may have rolled that dial to full hot when filling the radiator in order to purge the heater core of bubbles, then forgot to roll it back for you.

Check these two things first, let us know if you still have a problem.