What causes a coolant leak only when a car is running

A coolant leak that only occurs when a car is running can be frustrating and potentially dangerous. It's important to identify the source of the leak and address it promptly to prevent engine damage or overheating.

Possible Causes:

Water pump: The water pump circulates coolant through the system and can develop leaks at its seal. This usually manifests as a leak when the engine is operating and pressure is applied to the pump.
Radiator: The radiator is responsible for dissipating heat from the coolant. It can develop leaks due to corrosion, impact damage, or wear and tear. Coolant may only leak when the radiator is pressurized by the running engine.
Heater core: The heater core transfers heat from the coolant to warm the cabin. If the heater core develops a leak, coolant can seep into the passenger compartment when the heater is turned on.
Loose or damaged hoses: Coolant hoses connect various components of the cooling system. Loose or damaged hoses can cause coolant to leak under pressure when the engine is running.
Head gasket failure: A head gasket failure can allow coolant to leak into the combustion chamber or oil passages. This usually results in coolant loss and other symptoms, such as white smoke from the exhaust or oil contamination.

Related Questions:

What are the signs of a coolant leak? Answer: Visible coolant on the ground, low coolant levels, or overheating.
Can I drive with a coolant leak? Answer: It's not advisable to drive with a coolant leak, as it can lead to overheating and engine damage.
How do I find the source of a coolant leak? Answer: Inspect the engine bay, follow the hoses, and use a coolant leak detection kit.
Can I fix a coolant leak myself? Answer: Simple coolant leaks can be repaired with leak-stop additives or hose clamps, but more complex repairs require professional assistance.
What are the consequences of ignoring a coolant leak? Answer: Engine overheating, catastrophic engine failure, and potential safety hazards.

Related Hot-Selling Products:

Motorcraft ZD-7 Coolant Additive
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Gates Coolant Hose
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What Causes a Coolant Leak Only When a Car Is Running?