I have the same problem, I pulled the cap off where you add R-134a and its leaking, it bubbles out a greenish blue for a few secs every time i pull the cap off...and while driving when its like 83 or lower outside it works nice, anything like 90+ a few moments of cold then it gets hot and I turn it off. Also, I have to hold my gas pedal down at stoplights and make it idle about 1000 to keep cool air when it is hot, it works great when the rpms are between 1-2k. I think i have a leaking head gasket too, because my temps fluctuate from colder then normal to hot..............