![]() ![]() If these have cracked, you’ll need a new radiator. Many modern cars have plastic tanks on the sides or top and bottom of the radiator. Take your car to a good radiator shop or a trusted mechanic to get it fixed. The thermostat is one of the most important parts of the cooling system. Leaks often lead to a low coolant level, resulting in engine overheating. Havent pressure tested the cooling system but its probably not HGs based on rad hose test. Your car’s cooling system is an assortment of components and hoses, nearly all of which can develop leaks. 55k miles later (45k of them deleted and tuned) I still mysteriously lose coolant with no signs of it leaking anywhere. Originally thought the water pump, did it at 80k. If your radiator is wet on the outside, or it has crusty white or rusty residue, chances are that it’s leaking. Every 5-10k miles I have to top mine off after getting the low coolant light. Check the sides and bottom of the engine for evidence of leaks. If there’s a crack in the engine block, or your car has been subjected to sub-freezing temperatures, there are relief plugs to allow freezing coolant to expand without breaking the engine. Coolant runs through your car’s engine to soak up heat, then travels to the radiator to cool off again. Check the hoses that run from the engine to the cabin, and check for dampness under the dashboard. If no pressure - due to rad cap not holding a seal. If you can smell coolant in the cabin when the heat is on, there might be a leak in your car’s heating system. These cars are designed to run at high temps so the coolant needs to be kept under pressure to stay liquid. Most cars use engine coolant to warm the cabin. The most recent cooling system work was a new water pump about 3 months/4k miles ago. Generally, when external coolant leaks happen, you will notice puddles or drippings of coolant beneath the car. Usually goes out after a minute or two of idling, then comes on again at speed. If the leaks get bad enough, your car’s coolant level will go down dangerously and trigger the coolant light to turn on and off. Coolant light comes on once car is warmed up and at speed. These places are less likely to be leaking, but if you haven’t found the leak, they’re worth checking. (Edited) ArcticMallard said: 04 330i, 105k miles.
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