Recently had the a/c compressor replaced in my 97 villager and all seemed to be well, however, I noticed that at stop lights, air seemed less cool than when the car was running. At the green light, when I first accelerated, warm air blew in even though a/c is turned on. I also noticed that the engine temp. gauge is running almost to overheating point. The engine seems to be "cycling" loudly as though it's trying to turn something on but can't. I checked the coolant level and it's actually above the Max line - done by the garage I suspect. Could overheating prob. be related to the recent a/c work done?