I bought an 89 LX and the guy had purchased a new heater core, evaporator core and accumalator (dryer) for the car. The heater core is bad so I've pulled the dash out and I've already replaced the evaporator core and the heater core. I split the evaporator core case open to pull the core. I don't know if it has to be sealed but I used some insulation tape to keep it closed. I've already drained the oil from the compressor and put the orriface in the bottom evaporator core line (it didn't have one in the old system). Everything connects up but I haven't started putting a vacuum on the system because I don't if I forgot anything. Any help would be great. Thanks.