I usually drive on the highway and never have overheating problems. But while driving in heavy traffic recently my car has been overheating. I suspect the fan isn't turning on and I have never seen the fan run. After sitting still with the AC running after about 1 minunte the engine will drop rpms and the brake pedal will become much softer for 1/2 a second and the AC will turn off. As soon I start moving again the AC resumes. Any guesses? Should I take her to autozone to see if any codes popup? The CEL hasn't come on yet but the needle got close to red the other day and I don't want to wait any longer on this fix.