Heater core replacement is quite a hard and time consumming jobs. But, it's not mean impossible for you to save $2700+ if you can do your own. My suggess is that you have to make sure if the Heter core leaking. How you know!! quite easy. if your aircondition is still working fine, no outside leaking and have not recharged feon sometime, then probadly your heater core is ok. What usually happend is that dirt covers the draining hose and cause the water over flow and pilling from inside right on top of the computer. The water you see when a/c runing is from the air hummity, it needs to be draining out through a rubber hose is about 3 inches long. Right below, infront of heater core. Clean it up, checking it by pouring some water and see if it can escape though that hose. If it does, you are good to go. and replace the computer. you can rebuild your computer from ebay or (Toll Free: (866-983-6688 . Email: ate@autoecu.com Website: www.autoecu.com Location). Cheap and save instead of buy new computer. replace computer is quite easy. it is on passenger side, under the mat and carpet. Remove the black plastic cover and you will see it there. Good luck.. : :)