Question about 1999 Ford Taurus

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Vehicle overheats. Fans okay, head gasket ok and

Vehicle overheats. Fans okay, head gasket ok and new thermostat installed. What else could be problem?

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Possibly a plugged radiator or even a broken impeller on the inside of the water pump.so let me ask you,are you just looking at the temp guage? or do you hear or see the overheating?How long have you been chasing this problem?fill me in a little more and I will try to help you.have a good day get back to me Darrell

Posted on May 09, 2010

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My car (2003 Malibu) is overheating. The thermostat, water pump, and radiator cap has been replaced, yet it continues to overheat. What would you recommend be done next?


Check for blown head gaskets. GM aluminum-head engines are VERY UNFORGIVING when it comes to being overheated. The heads usually warp, resulting in blown head gaskets and repeated overheating like you are describing. One of the main symptoms will be that you fill the cooling system and open the bleader screws to get the air out of the system. Then you start the engine and run it until the cooling fan comes on. When the fan comes on, place your hand behind the cooling fan and see if the air coming through the radiator is HOT. If it is blowing cool air, the coolant is not flowing through the radiator like it should. This is usually caused by high pressure in the cooling system due to combustion gasses getting in.

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I have 1996 Honda Accord. The vehicle overheats, especially when the Air Conditioning is turned on. There is no thermostat in the car and the cooling fan doesn't work. Does it just need a new cooling fan?


If you run the vehicle with an inoperable radiator cooling fan you will overheat and destroy the engine. You will just make the problem even worse by running the aircon. The car should not be driven with an inoperable cooling fan.

A thermostat should be re-installed in the engine's cooling system and a new cooling fan installed.

If you have been running the vehicle with this overheat condition for some time you may well have already damaged the engine, the first sign of which may well be a blown head gasket and a damaged engine head.

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Either you have not bled the system, or possible fan not working, or head gasket problem. Solution

Step by Step
1. Check both hoses, do both have equal amount of pressure?
2. Run the vehicle where your gauge shows in the middle, shut the vehicle off then open the bleed valve near the heater line and wait till fluid comes out like a steady stream. Make sure you do not go low on coolant.
3. Turn on vehicle, turn on A/C high maximum blow check to make sure both fans are on. We are testing to make sure the fans at least work!.
4. After all this and you are still boiling over make sure your radiator cap is good if not then replace. Last but not least get a block tester to test for exhaust gases in the coolant. Rent one from autozone. $25.00 plus fluid which is about $8.00.

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yes the head gaskets leaking on modern aluminum head engines is all to common. never overheat them, if they start to get hot shut it down and find out why, it can of course be the fans and plugged radiators or faulty thermostats but sounds like in your case the head gasket is leaking and combustion gas is entering the cooling system and this causes an overheat

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1999 mercury cougar,overheats ,I have install new waterpump,have radiator clean and remove thermostat,radiator fans do turn on.I'm lost.


Sounds like a blown head gasket .But thats easy bad relay switch or coolant temp switch or bad resistor.

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Can you see the cooling fans come on? When the engine gets to 212 degrees the fans should come on. To test the fans, with the engine running turn the A/C on high, the fans should come on .
The system also has a 212 switch that screws into the intake manifold. This is what turns on the fans with no A/C.
I hope this helps you.

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Overheating when driving no mixing of the coolant and oil


The three most likely thing's cause overheating are faulty thermostat,electric fan or clogged radiator. Only at has been overheat so much it boils dry that it will cause engine trouble. Most common problem's are blown cylinder head gasket or a cracked cylinder head.
mixing coolant and water depends on where the gasket has blown or head is cracked. You will first need to check if it actually is overheating. The reason is. If the head is cracked or gasket blown then you can get a false boiling which is compresion from the cylinders blows through the crack in the head or gasket causing the coolant to blow out of the radiator cap.Fill the radiator to the top leave the cap off then start the engine.If the water blows out then you will need to remove the cylinder head check the gasket is ok. If its damaged replace if not get the head checked for crack's. If no water blow's when you start it check the thermostat is working properly. To check the thermostat put it a in a saucepan cover it with water bring the water to the boil. It should open before the water boil's but near boiling-point. If its ok then start the engine again leave it running until it boils and check the fan is running. If that's ok then its radiator problem. Their is no way to check if the radiator is ok you will need to get a new one. One last point. If the cylinder head or gasket are faulty it was caused by overheating so by just fixing the cylinder head problem is not a cure it will overheat again. Check the three things I mentioned at the begining and told you how to check them. Hope this help's. Cheer's

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Thermastat stuck and cooling fans do not come on


If your thermostat is stuck in the closed position , it will not let coolant circulate to the radiator and the engine will overheat quickly. Fans won't come on because the temp sensor for the fans is usualy in the radiator. If the thermostat dosn't send hot coolant to the radiator , the fans don't know they should be on.
Only solution is to replace the faulty thermostat. I recomend that you dont drive the car at all with the bad thermostat. major overheat could severly damage Heads , head gasket , engine.

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