Question about 2000 Buick LeSabre

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Coolant disappears with no visable leaks.

After sitting overnight, resevoir is empty and engine struggles to turn over. When cranks, white smoke boils fron exhaust for five minutes.
I have been told that I have a hole rusted in the plenium, letting coolant into the engine. Is the plenium the same as a manifold? Where is it located?

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If you have either the 3.1L or 3.4L engine, these are common to have the intake manifold gaskets leak. You can check to see if this may be the problem by looking underneath the throttle body with a flashlight an you should see coolant on the engine block, or you can also look at the engine block on the sie where the power steering reservoir is located. You may also have a head gasket that is bad, you can tell if this is your problem by checking the oil, if it looks like chocolate milk on the oil dipstick, there is a good chance that coolant mixed with the oil. Also the 3.8L engines have problems with intake manifold gaskets leaking as well. Hope this helps.

Posted on Mar 10, 2009

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This is what they are talking about, a major problem for GM. Google it and you will see how big the problem is. Don't drive the car until you fix this.
coolant disappears with no visable leaks. - eab4538.jpg
The 3.8-liter V6 may leak coolant into the engine from the intake manifold. A new gasket kit, revised throttle body nuts, and sealing compound is available.

Posted on Mar 10, 2009

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1 Answer

Smoke coming from engine


Where is the white smoke coming from? Under hood? Out tail pipe? If excessive white smoke from tail pipe, suspect a head gasket failure which in turn will fill the cooling system with exhaust pressure forcing the coolant to come out of the reservoir and resulting in an overheating problem

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Coolant boiling in resevoir.


It can be faulty coolant temperature sensor.Its not sensing exact coolant heat temperature so its overheating then required level.

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Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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1 Answer

Coolant disappearing


If you are adding coolant every week, and you don't see any external leaks, the coolant is probably being burned thru the engine.
You can burn a couple of quarts a week and not see any smoke.
At some point in time you could pull the spark plugs and find evidence from the burning coolant.
Most common cause is a leaking head gasket or intake gasket.

Aug 08, 2012 | 2002 Chevrolet Malibu

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I have a Mercedes 94 C280. Ran great until the other day. Radiator light came on and off. Then it took a few tries to start, then when it did, there was white smoke coming from exhaust. Stopped the car,...


this is a sure sign that theres a blown head gasket and maybe a crack in the cylinder head, the engine is burning the coolant, the white smoke and the hard starting is due to coolant entering the combustion chamber and burning it and will cause overheating and other problems, this car can not be driven,the is a costly repair,

Jun 25, 2011 | 1994 Mercedes-Benz C-Class

1 Answer

I have to add coolent every day, but i have no visable leak overflow bottle fills, but never empties


It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot any leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank.

The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old. Check all hoses and clamps for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.

Oct 04, 2010 | 1998 GMC Jimmy

3 Answers

I am losing coolant, not from the radiator and not from the resevoir, where else could it be coming from. The resevoir is empty in 1 week after fillup


you could have a blown head gasket and coolant could be leaking into your combustion chamber.
rent a radiator pressure tester and see if the cooling system will stay at constant pressure. If the pressure drops you have a leak, and it could be your gaskets. pretty costly to repair.
make sure you have not blown the seals on the engines water pump. when they go out, the burst disc on the pump open and gush coolant everywhere.

Dec 19, 2009 | 2004 Pontiac Grand Prix

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99 Grand Am was leaking coolant from the over flow?


could be that it was hot or could be that you have a blown head gasket. If the engine got hot once it could have been enough to blow the head gasket. Does it blow it out after it warms up every time?

Sep 09, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Losing Coolant


You may very well have an internal leak as in a blown head gasket. If you see white smoke from the exhaust and it smells sweet that is a definate sign you do. You may also notice a white foam on the underside of the oil cap and the oil level may be over full. Remove the radiator cap, engine cold, and start the engine. If you see air bubbles escaping you have a blown head gasket or cracked head. Stop driving the car until you verify this with a compression test. Severe engine damage will occur if you continue to drive this car, if the head gasket is blown.

Aug 02, 2009 | 1991 Volkswagen Jetta

1 Answer

Fos the past five months unexplained coolant leak....Had pressure test twice, no white smoke from tailpipe,spark plugs look fine, never any spots under the car. It runs great. We decided to check the oil...


Thick black oil generally does not indicate coolant in oil...that appears as coffee coloured residue with a milkshake thickness to it. But, I'd let the car stand overnight and then drain oil. coolant will stay at the bottom of the pan and exit first, so watch carefully.
Next, have a shop dye check for leaks...often small leaks are in the form of seepage that is light enough to evaporate on the hot engine before reaching the ground. Another test you can do is to let it sit overnight with the radiator cap off. Sometimes a water pump seal will only leak when not under pressure. (like when you try to empty a can of dog food...punch a hole in the bottom of the can and it will fall right out!) Also, check the rug inside the car...any dampness indicates a leaking heater core.
I hope at least one item here will help. Obviously if you are loosing coolant, it has to be going somewhere. PS: use a good grade of synthetic oil and it should not break down as quickly as what you are using (regardless of if contaminated or not)

Apr 20, 2009 | 1999 Ford Taurus

2 Answers

Coolant dissappears with no visable leaks.


Yes...sort of the same...you are getting coolant in the motor...like a hairline crack in the head.

Mar 10, 2009 | 2000 Buick LeSabre

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