Question about 2004 Ford Explorer

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No visible leaks in cooling system but engine overheats. 2004 Ford Explorer 4.0L V6. Fan working fine. Any suggestions.

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#1.airlock in system....undo a heater hose clip to bleed.#2 thermostat jammed..replace.#3..water pump shot..replace.#4..radiator clogged..backward flush the system..

Posted on Oct 15, 2010

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U may want to have the system flushed this would get any obstructions out of the system if the problem continues have the water pump checked.

Posted on Oct 15, 2010

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8 Things that Can Cause Your Car to Overheat..
> The coolant level is low.
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>The radiator cooling fan is not working properly.
>The radiator core has become clogged.
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My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.

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Unfortunately this will be kind of hard but, it sounds like you may have a blown head gasket depending on where on the passenger car it's leaking? Drive the car get it hot. Leave it running get out and pop the hood. Start looking for leaks. Use a powerful flashlight to help look. If it doesn't leak while you're driving and only after the car is shut off then I'd say you're creating a vacuum in the coolant system, change your coolant cap at that point.

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Causes can be:
Thermostat is defective and fails to open, but that is not common.
Radiator is clogged inside or a plastic bag has got sucked to the front or the fins are full of dirt. Low coolant level due to a leak. Defective water pump impeller due to corrosion. Defective cooling fan on engine.
You don't say how fast it overheats or under what conditions (idle, freeway etc.) so that kind of handicaps my diagnosis

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Does the electric fan come on? If not it could be the thermostadt for the fan or it could be the thermostadt not functioning in the cooling system.

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My 2001 lincoln ls v6 and my cooling system isn't working right. It overheats and the guage is spuratic. It starts to cool down and in a split second it is over heating the guage is tacked and the alarm...


The most common thing if there is no visible leak would be #1-thermostat has gone bad #2-fan clutch or electric fan not working. Good Luck.

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I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

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