So today I finally got stuck in a stand still traffic. A/c was blowing really cold earlier. However, when I was at a stand still, it only blow cool air. I had to kept my RPM up to get it to blow cold air again. When I finally moved again, it got cold. 100+ degree in Houston is not a place you would want to be without A/C. What could be the problem be? Air in the hoses? The car was converted to R134a.