Chances are if you need a new Isuzu heater core, you know it. You may not know that's the name of the part you require, but when there's green coolant soaking the carpet in your Impulse or Rodeo and the antifreeze level in your radiator keeps going down, what you have is a bad Isuzu heater core. The Isuzu heater core acts like a small radiator inside your car or truck. Instead of sending the engine heat out to the atmosphere like your engine radiator does, the Isuzu heater core transfers the heat to the air flowing through your car's ventilation and air conditioning system. Coolant doesn't always pass through the Isuzu heater core: When you have the heat turned off on the dash, a valve under the hood prevents the hot antifreeze from circulating through the Isuzu heater core. That same valve opens when you dial up some heat, and the hot water goes rushing through the Isuzu heater core. Obviously, if you have a leak in your Isuzu heater core, that hot water goes rushing onto your dashboard and carpeting as well-not good. Plus, a bad Isuzu heater core will prevent the air in your interior from heating up sufficiently, making it hard to defrost your car-or yourself-in the middle of winter. So what do you do? Replace your Isuzu heater core with a new unit from us. We supply OE quality Isuzu heater core units that are an exact replacement for your worn out original. As for installing your new Isuzu heater core, well, that's up to you. You can attempt the job yourself or have a professional put in the new Isuzu heater core. Either way, the result is a nice, warm, dry interior and that's something to look forward to.