GM 3093285
Evaporator Core

You should start the Evaporator core replacement process by removing the air cleaner and duct assembly followed by properly recovering all refrigerant. The cooling system drain operation should begin before you remove the Heater Core. You should first detach the Evaporator lines from the a/c Evaporator and then remove the bolts from the Evaporator core cover before taking off the cover. You must remove two types of bolts holding the Evaporator core and the core itself. Afterward, take off both the Evaporator support strap and the Evaporator water core filter retainers along with the water core filter. The installation process begins with mounting the Evaporator support strap before installing the water core filter together with its retainers. Install the Evaporator by screwing the Evaporator core bolts to 1.5 n.m (13 lb in torque), then mount the Evaporator core cover including its bolts which should also be tightened to 1.5 n.m (13 lb in torque). Reinstall the Heater Core while proceeding to fill the cooling system followed by reconnecting the a/c Evaporator lines at the Evaporator. Before completion the technician must evacuate the system and recharge it while inspecting for leaks then reattaching both the air cleaner and duct assembly.