Purchased a new 1998 GS300 and it still looks like new, inside and out with 147,000 miles. I love the car and would l have no fear driving it coast to coast. However, I am having A/C issues that relates to a very slow leak of cooling refrigerant, most likely under the dashboard that no mechanics have been able to pinpoint even with the dyes. I live in Southern Indiana with a lot of hot and humid summers and only relief has been recharging about every two weeks. Any ideas? Do I keep or get rid of it?