MY 1996 LS400 HAS JUST BEEN RECHARGED, THE AIR WAS ORIGINALLY WARM, AFTER CHARGING IT IS NOTICEABLE COOL (BARELY) AND THE A/C BUTTON KEEPS FLASHING. AM SUSPECT THE CABIN FILTER(S) NEED TO BE REPLACED (WHICH WILL BE DOING VERY SOON). JUST WANT TO BE SURE SOMETHING ELSE ISN'T CAUSING THE A/C BUTTON TO FLASH, BEFORE CHARGING IT DIDN'T FLASH. ANY INSIGHT WILL BE APPRECIATED.