HAVE A 1993 C4 WITH 105,000 MILES ON IT, BOUGHT IT THIS PAST MAY.A/C BLOWS COLD, TAKES AWHILE FOR THE AIR FLOW TO COME OUT OF THE FRONT VENTS. HAVE THE AUTOMATIC TEMP. CONTROL SYSTEM. THATS ONE PROBLEM ,THE OTEHR IS WHEN I SET THE TEMP. TO THE HIGHEST SETTING THERE IS ONLY MILD HEAT AND THATS A STRETCH COMING FROM VENTS ?