When the heater core fails, you’ll notice a lack of heat or even a coolant leak If the heater core has a small leak, you can attempt to repair it with heater core sealant. A leaking heater core can be an annoying and potentially dangerous issue in your vehicle The best heater core leak repair involves using a specialized sealant or replacing the heater core to ensure proper function and prevent coolant loss. Like other cooling system components, the heater core can develop problems over time Corrosion can cause leaks, while debris and buildup in the cooling system can create clogs that restrict coolant flow
Because of its location deep inside the dashboard, replacing a heater core often requires a good amount of labor to access. To fix a heater core leak temporarily, several methods are available, suitable for roadside repairs to avoid costly towing Although these solutions disable the heater, they allow continued use of the vehicle in the short term. When heater cores go bad, they leak antifreeze onto the floor of the front passenger area
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