* Loss of Coolant: A leaking heater core will steadily lose coolant, leading to overheating. Overheating can cause severe engine damage, potentially requiring costly repairs.
* Reduced Heating/Defrosting: The primary function of the heater core is to warm the cabin. A leak will drastically reduce or eliminate heating and defrosting capabilities, making the vehicle unsafe, especially in cold weather.
* Safety Hazard: The leaking antifreeze is toxic. If it leaks into the passenger compartment, it can cause health problems if inhaled or ingested. The sweet smell of antifreeze can mask its danger, especially for children and pets.
* Further Damage: Driving with a low coolant level can cause the engine to seize, requiring a far more expensive repair than just replacing the heater core.
In short, a leaking heater core requires immediate attention. Have it repaired by a qualified mechanic as soon as possible. Driving with a leaking heater core is risky and potentially very costly.
