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Thermostat Replacement

Model: Lexus IS MK 3 - Years 2013-2024
Part: Thermostat

The thermostat regulates the exchange of hot engine coolant with cooler coolant from the radiator: at intervals determined by the temperature of the fluids, this valve opens and closes cyclically. Due to deposits, it can become stuck and cause engine overheating; to replace it, remove the plastic covers on the engine and the scuttle panel; drain the coolant from the designated drain plug under the radiator, remove the auxiliary belt and the pulley located right in front of the thermostat housing; replace the old thermostat with the new one, reattach the auxiliary belt, the plastic covers, and refill the cooling system with the appropriate coolant.

Updated on 16 February 2026 by ScegliAuto

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