Toyota 87107-20350 Unit Sub-Assy, Heater Radiator

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Disconnect the negative cable from the battery. Drain the cooling system and remove the cooling unit assembly. Working in the engine compartment, disconnect the heater hoses where they enter the firewall by squeezing the hose clamp tang together. Remove the center console and center trim panel. Remove the heater controls and be sure to mark the locations of the cable clamps on the cables to ensure correct adjustment upon reinstallation. Label and detach the air ducts, wiring and controls still attached to the heater housing. Remove the screws and clips and separate the two halves of the heater assembly. Take out the old heater core and install the new unit. Reassemble the heater unit and check the operation of the control flaps. If any parts bind, correct the problem before installation. Reinstall the remaining parts in the reverse order of removal. Refill the cooling system, reconnect the battery and run the engine. Check for leaks and proper system operation.