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Theres a leak. Probably a hose but could be radiator or heater core, water pump or engine core plug

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Q: The smell of radiator coolant as the car is running?
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How do you know if water pump has broke on my car?

You should see the coolant circulating in the radiator when the car is running

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Likely as not there is a coolant leak, perhaps in the heater core.

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After running your car for 20 minutes or so ,and there is coolant in the radiator, you will get no heat.

What if coolant leaks when car is parked and radiator still has fluid where and why would it be leaking also what if you can smell it through the car while driving with out heat or AC on?

I would check the radiator coolant bottle for cracks and inspect any hoses to bottle.

What if you smell coolant outside the car?

You normally smell the antifreeze so open the hood and look for a leak before you see it big time running out from under your car.

Why does your radiator leak only when the car is on?

When vehicle is running: Water pump is circulating coolant and cooling system pressure is building

When the car is running it pumps the coolant out of the overflow tank. It is a 1998 Cadillac Deville 4.6L engine. Do I have a bad radiator cap What are the symptoms of a bad radiator cap.?

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