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Coolant coming out clean is a good sign. How to spot a bad radiator A radiator is a device consisting of tubes through which coolant flows and fins connecting the tubes. The fins increase the surface area of the radiator (dramatically), increasing cooling efficiency. The surface of the radiator should look uniform. If there is an area where the fins are ...


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What @blacksmith37 says is true, kinda. You could stick the hose into a catch bottle, and that would tell you that coolant is coming out during high load, high temp conditions. That's it. The coolant in that bottle WILL not go back into the radiator during cool down, like in a more modern cooling system. What makes that work in a modern flow back overflow ...


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The reason the cooling fan comes on when you turn on the A/C is because in front of your radiator there is another part that looks just like a radiator called a condenser. The condenser works the same way that the radiator does in that it radiates heat to the atmosphere, and it does this more efficiently when air is moving faster through it. The scientific ...


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It's best to minimize the amount of air below the cap, so topping it off up to the ring that the cap seals against is best BUT if you've just replaced the coolant, there's likely to be air elsewhere in the system anyway. Some vehicles have a defined bleeding process you have to follow to get the air trapped in high points out (usually the cylinder head and ...


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