Question about 2000 Buick LeSabre
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?
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
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.
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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Posted on Jan 02, 2017
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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.
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