![]() ![]() The intake manifold gasket is found at the spot where the manifold connects to the engine. This is yet another issue that can cause problems with the engine on and off. The water pump’s job is to push the coolant through the hoses smoothly.Īs the water pump starts to fail, the coolant can no longer flow the way it should. If the water pump becomes damaged, you might notice a huge coolant leak. RELATED: How to Test if the Head Gasket is Blown (7 Easy Steps) 5. This problem occurs when the engine is running and when it’s off, but running the engine is more dangerous, since the motor will start overheating.Ī bad head gasket can also cause external coolant leakage and you will see if coolant leaks out between the engine block and the head. The head gasket is responsible for keeping the oil and coolant separated from one another.Īs coolant leaks into the system, it’s no longer able to keep the engine cool. If the coolant has started leaking into the engine oil or combustion chamber, a blown head gasket is the likely cause. RELATED: 6 Symptoms of a Bad Radiator Cap (& Replacement Cost) 4. The radiator could also be cracked or damaged from any external damages like corrosion or stones when traveling at high speeds. Additionally, the coolant reservoir could overflow when you run the engine because of the higher pressure in the hoses. If the cap is damaged, coolant can leak out, leading to lower levels in the radiator. It also helps to regulate the pressure in the radiator. The radiator cap is needed to keep the coolant in the system where it belongs. The heat and constant pressure can increase the wear if left unchecked. As the motor runs, the pressure of the system can either increase the leak or decrease it, depending on where the hole is.Įither way, hoses can become brittle and worn over time, which is why they should be regularly inspected. ![]() Damaged HosesĪ broken hose can also cause a leak when the engine is running or not. You might also see leakage under the vehicle around the passenger or driver seat area. If the heater core is bad, you will notice trouble getting heat into the system. The heat that is generated from the system gets blown into the vehicle through the HVAC vents when you activate the heater. Hot coolant gets pumped into the engine through the system’s heater core. Here is some more detailed information on what could cause a coolant leak when the car is running. A bad intake manifold gasket could also be to blame. It’s also possible that there is a bad heater core or a blown head gasket. Be careful, as the fluid can become extremely hot to the touch.Can I Drive With a Coolant Leak? Causes of Coolant Leak While Car is RunningĬoolant leaks when the car is not running can be caused by damaged hoses, a bad radiator cap, a bad radiator, or a defective water pump. Once the bubbles stop, check to see if there are any leaks and take the car for a test drive.You’ll likely need to squeeze and release the hoses to remove any trapped air bubbles in the hoses as the car cycles the new fluid through the engine and radiator. Start the car with the radiator cap still off.Reconnect all the hoses to the new radiator.Remove the tape from the hose that housed the old thermostat and replace it with the new one.Insert the new radiator and bolt it back into place.Install the fan bracketry on the new radiator. ![]() Remove the fan bracketry from the old radiator.Holding the top of the radiator, remove the top nuts and bolts holding it in.Find the bracketry holding the blown radiator in place and remove the bottom nuts and bolts first.Some cars have fans mounted to the radiator, so you’ll need to disconnect the fans.Plug the holes by taping over the outlets.Once drained, remove the remaining hoses connecting the radiator to the rest of the engine.Drain what’s left of the coolant from the radiator into a bucket by loosening the hose clamp near the base of the radiator or unscrewing the drain plug.Let the car rest and cool for 5-10 minutes. ![]()
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