If you over tightened the bolts you will crush the gasket and it will leak. Also check the drain pan to se if it is clear. You will need to go up top and pull the cover and also the plastic housing for the unit. While you are in the u nit you might as well clean the coils. First brush all or the lint off the evaporator coil with a soft brush being careful to not damage the fins.
You may need to replace the gasket with a new one. You will need to disconnect the wires at the unit and take the 4 bolts out from below. Put down some cardboard or plywood and roll the unit over on its side. Scrape off all of the old gasket. Stick the new gasket to the bottom of the unit and gently roll the unit back into place. DO NOT use and caulk on the gaskets...it makes a real mess.
Back inside, lift and scoot the unit where it is centered over the hole and tighten the bolts to where the new gasket is compressed 50% of its original thickness.
And welcome to iRV2.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot