The Lexus RX350 Heater Core provides cabin heat and clear windows by using heat in the engine to heat the cabin. Tucked under the dash, this miniature radiator takes hot coolant pumped from the engine pump via attached hoses, and as the blower fan forces air across its finned aluminum or brass surface, that air absorbs heat before passing through the vents. Early Lexus RX350 models applied a simple coolant valve or blend door to control the flow start/stop, and later Lexus RX350 generations applied electromechanical actuators and thermistor feedback to enable precise dual zone control where the driver and passenger can set their comfort individually. Regardless of the year, the Heater Core can also be applied to rid itself of excess heat as an auxiliary radiator, assisting engine temperature management ever so slightly. Because the Heater Core is deep behind trim panels, the Heater Core clog or leak repairs require extensive removal of the dash, so prevention of clogging of the cooling system is critical, as a healthy Heater Core keeps the cabin of the RX350 cozy and the overall Lexus ride comfortable.
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