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I have a 2000 Eddie and just had the same problem, it ended up that the thermostat was sticking and the radiator had some build up in it. That in turn led to the water pump going down and stated leaking. First thing I would do is check the thermostat and hope that the reason because it's only a $10 fix. If that's not the problem I would flush the radiator and lastly, look at the water pump if the other two didn't work. I just shelled out $891 to have all this replaced.

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12y ago
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13y ago

1. check if the water pump is running.

2. check if the thermostate in the coolant line is rusted close so the coolant is not running through.

3. check if the oil and antifreeze is low.

4. Definitely check the water pump....the OE water pump impellers are made of plastic and will break causing coolant not to flow. The new replacement comes with a metal impeller.

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14y ago

There are a number of reasons that can cause an engine to run hotter than it was designed to. It could be any one or a combination of:- Low engine oil level - Inoperative thermostat [stuck on closed] - lean air/fuel mix - last but most likely, the down tubes in your radiator are blocked/partially blocked. You will have to remove from car, take off the top and bottom tanks to clean out tubes. Easier to buy a new one.

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11y ago

Low coolant, stuck thermostat, failed water pump, radiator restriction, inoperative radiator fan, failed headgasket, etc.

Low coolant, stuck thermostat, failed water pump, radiator restriction, inoperative radiator fan, failed headgasket, etc.

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9y ago

A 1999 Explorer could be running hot for several reasons. The thermostat could be stuck. Coolant could be low. The cooling fan could be bad, or the water pump could have failed.

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13y ago

Because there is a failure of the engine cooling system (water-pump failure, integrity failure (head-gasket leak), fan failure, radiator clogged, etc.)

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11y ago

Low coolant, stuck thermostat, failed water pump, radiator restriction, inoperative radiator fan, failed headgasket, etc.

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Q: Why is your 1999 ford explorer running hot?
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