Toyota 89428-15030 Switch, Temperature Detect

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If the coolant temperature gauge is not working, start by checking the fuses. If the temperature gauge indicates hot shortly after starting the engine cold, disconnect the wire at the coolant temperature sending unit and if the gauge reading drops, replace the sending unit. If the reading remains high, there may be a shorted wire or a faulty gauge. If the coolant temperature gauge fails to indicate after the engine has warmed up and the fuses are okay, shut off the engine and connect the wire at the sending unit to a clean ground on the engine. If the gauge now indicates hot, replace the sending unit. If the gauge still does not work, there may be an open circuit or a faulty gauge. To replace the sending unit, start by releasing any pressure in the radiator by removing and reinstalling the cap. Disconnect the wiring harness from the sending unit and apply sealant to the threads of the new sending unit. Unscrew the old sending unit and quickly install the new one to prevent coolant loss. Tighten the sending unit securely and reconnect the wiring harness. Refill the cooling system, run the engine, and check for leaks and proper gauge operation.