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Why would antifreeze leak from the exterior driverside firewall 2002 Mazda mpv?
Wiki User
∙ 15y ago
Because your Vehicle's heater derives heat from hot coolant that is cycled out of the engine block. Basically, a coolant line is routed from the engine, through the firewall, and through radiating fins in front of the blower motor's output. The heat that comes out of your car's heater is actually heat energy absorbed from the engine block into the coolant, and then the heat energy is absorbed from the coolant when it goes through the *heater core* (radiating fins) and absorbed through the radiating fins and heats the air that is pushed through by the blower motor (resulting in hot air). The coolant after it goes through the radiating fins of your car's heater core is then pumped back through the firewall and to the radiator where it is cooled much more. The coincidence is that when you go to your vehicle on a 45 degree or colder day, and start the engine, turn on the heater, and it blows cold air: it's because your car's engine hasn't warmed up yet. Once it idles for 20 minutes, or 10 minutes of driving, the heater is crispy hot and feels good. One of the coolant lines going through the firewall has a leak.... STOPLEAK might fix it. STOPLEAK also likes to freeze up old thermostats, so be careful. Do you mean the leak occurr outside the vehicle, not inside? Are you sure it's not just the condensate from the AC from the drain tube? if it's antifreeze, then you have a leak. The lines for the rear heater are notorious for rusting out.
Wiki User
∙ 15y ago
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