So I recharged my AC with R-134. Watched a video, hooked to the port explained on the video and filled her up. Blew cold worked great... For about 3 days. Now it is blowing warm constantly and when I tried to do the same thing again it had no effect. In fact when I was on the highway, after starting it and driving for a few miles it wasn't blowing strong through my vents at all.. where are the hi and low ports located. I only found one up top passenger side near top of strut mount in engine bay... Where's the other port