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Fits GS 250, GS 350, IS 250, IS 250C, IS 350, IS 350C, RC 200t, RC 300, RC 350Heater Hose - Repair or ReplaceA heater hose transfers heat from your engine’s cooling system to your vehicle’s heater. If the hose is leaking, ruptured, or appears to be on the verge of failure, bring your 2009 Lexus IS 350 to our Lexus service department for repair.