Is it a little chilly inside your Lancer or Montero, even when you've cranked the heat all the way up to eleven? Time to give your Mitsubishi heater core a checkup. The Mitsubishi heater core is a small radiator inside your dash that's responsible for heating up the air that flows through your HVAC system. If the Mitsubishi heater core has a clog or a leak, you'll get decreased output and, in the case of a leak, you may end up with interior damage. A clogged Mitsubishi heater core can be just as troublesome because it can rapidly lead to a leak. Pressure builds up in the thin tubes that make up the Mitsubishi heater core and can lead to a dramatic rupture...think Old Faithful but in your lap. That's why you need to investigate any reduction in heat to ensure there's not a more serious event occurring within your Mitsubishi heater core. Besides being annoying, a leaking Mitsubishi heater core can be a serious rust producer. If the Mitsubishi heater core leak is small, coolant can travel under your carpet and sit on the floorpans for months without you noticing it. That can lead to serious structural rust in your car, and that means big bucks. The moral of all these stories is that if you have any of the symptoms of a bad Mitsubishi heater core, get it checked out and order a new Mitsubishi heater core from us if a problem is found. Your car will stay rust free and you'll be able to enjoy a brisk winter morning from the inside of your toasty-warm Eclipse, courtesy of your brand new Mitsubishi heater core.