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DEI Heater Hotter is a 16 oz antifreeze additive formulated to accelerate heat transfer from the engine to the cooling system, helping your heater deliver warm air up to 50% faster in cold conditions. Safe to mix with all types of antifreeze, it is poured directly into the radiator and must cycle and mix with existing coolant to become effective; a functioning thermostat is required for full benefit.
DEI Radiator Relief Heater Hotter - 16oz.
