check your evaporator first it might be cheaper to by a after market set up. Still waiting on my evaporator and that alone cost $260 and that was the only thing wrong on my car. Between the evaporator and heat box kit and o-rings, drier, ester oil i have $450 invested. Hate for you to get it all together to find out the evaporator is bad. The heat box kit is $80 and worth it , it should be cheaper since it is a bunch of foam but thats life. Good luck