Question about 1999 Suzuki Vitara

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The water boils over and the car overheats within 15 mins of driving it is a suzuki vitara i just want to know is it head gasket or is it thermostat?

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Look at the coolant and the oil. If either one has the other mixed into it, it is probably the head gasket. If not, it mat still be the head gasket but try this first: Check the car visually for any cooling system leaks. Make sure that the overflow tank tube is not obstructed and the tank itself is not cracked or leaking and the that the cap is in good shape. With the radiator cap off, start the car and let it run, top off the radiator with coolant as necessary. Grab the upper radiator hose every minute or so while monitoring the cars temp. gauge also. The hose should warm up slowly if the thermostat is working and eventually become solid to the touch from pressure. Once it opens, bring up the rpm of the engine(1500 to 1800 rpm) while you top off the cooling system, install the rad. cap THEN let the idle drop down. Feel the upper hose for air bubbles. If they are present, shut the car off, let cool and repeat the process. You may have air bubbles in the system, test and/or replace the radiator cap before you test the system. I hope that works for you.

Posted on Apr 27, 2010

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On my Suzuki gran vitara 2002 I am losing engine coolant from overflow pipe,,overheats after 20 mins of driving(once coolant tank empty),,recently had a new thermostat fitted...please help,,thankyou


you might have a blown head gasket, when the engine is cold remove the rad cap start the engine and look for air bubbling into the rad , if you see said bubbles then you need to have the head gasket replaced. PS Do not remove the rad cap when the engine is hot as you could be seriously injured/burnt

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It really runs hot within a minute of starting ?
An engine that runs hot in a few minutes is often having problems with the water pump or a blockage in the cooling system. The thermostat does not open until 195 degrees which takes 5 or 10 miles of driving.
During that time, the water pump should be circulating coolant in the block and the heater hoses.
A leaking head gasket should be putting extra pressure into the cooling system, and-or dumping coolant into the cylinders which would come out the exhaust pipe. But it should still take a few minutes for the engine to reach the boiling point of 240 degrees.

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Excessive overheating!!!,water within oil.? Was told buy friend needed water pump.? Yet now told it may be the head gasket, or manifold gasket? To drive i constantly fill the antifreeze tank with water yet...


Sounds like a head gasket to me. If the oil is milky than the only way coolant can get into the oil is through the head gasket. Since there is also a lot of whit smoke out the exhaust coolant is getting into the combustion chamber and then getting pushed out the exhaust. Your best option might be to find a low mileage used engine. Heads gaskets can get very expensive!

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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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Its probably not boiling what you are getting is preasure from the engine which can be caused by a faulty head gasket but as you have that changed then it must be a crack or warp in the cylinder head. Get the head preasure checked for cracks and warp. If ita warped get it skimmen if cracked you will need to replace.

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1 Answer

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original issue sounded like thermostat but now that you have lost power i would have to say thermostat, blown head gasket, and warped head

to check thermostat find and remove place in pot of boiling water the see if it opens, then to ice water to check if closes.


the only way i know to check headgasket and head is to check oil and water. oil will have water in it, and water iw have oil in it

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