A/C has been weak since I purchased car last December. Salesman said he would take care of low freon when the warm weather came. Last Friday, it got to mid 80's and humid and the A/C did not do much. I took it in today for a recall (9132 pwr steer line) and had them check freon level. It was NOT low and the mechanic told me system checked out good. Anybody have an idea why I'm not getting much cool air? It's a 2006 LTZ.