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Have you checked your thermostat?

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Q: Why is your car overheated but radiator full of water heater blowing cold air and knocking sound?
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Why is the heater blowing cold air on a 2000 mountaineer?

Because you don't have enough coolant in your radiator.


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if engine overheated when heater core blew, u may have damaged bearings in engine, or dropped a rod, or maybe water pump went out as well


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The heater core is leaking. GEt a manual from DISCOUNTAUTOREPAIRMANUALS.COM and replace it.


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What can cause a heater to stop blowing heat?

well you could just turn the heater off heater blower ---- If it is a car heater then check your coolant level. the heater is driven off a heat converter that is fed by the radiator system. When the coolant fails to pump round the radiator system the car internal heater doesn't work. Driving without coolant in the system will result in the engine overheating and seizing.


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What can you do to cool an overheated engine in a car?

You can turn on the heater as that will cool the coolant more. If the car is sitting still and off, opening the hood will help. If you have a hose available..spraying the radiator with help drop the coolant temperature by increasing the radiator's efficiency.