2005 4runner sport, v6. 255k. The climate control on this has always been fantastic, but the ac is slow to cool down on hot days and only pumps out really cool air out of the passenger vents. Relevant info is that I have slow leak from the coolant somewhere and I have to refill the resovoir every 1000 miles or so. This last time it was maybe a bit more than a resovoir down. What should I be thinking about to resolve this?