Question about Chevrolet Cars & Trucks
2000 Chev. Silverado 5.3L I have oil & coolant mixing together. Truck is not over heating. Have to top off coolant about every month.
You have a bad head gasket, intake manifold gasket, or warped heads. You'll need to take it to a mechanic to confirm which. Or, if your a do it yourselfer and have the space/tools, you could do a top end rebuild yourself. I'd have it checked out by someone soon, as it's gonna get worse over time, and could to even more extensive repairs being needed.
Posted on Jan 14, 2013
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Posted on Jan 02, 2017
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
Posted on Aug 16, 2009
If you are getting coolant mixed into your oil it sounds like your head gasket is leaking, I hate to give bad news but that;s not easy to replace and it's gonna be expensive.
Best of luck
Posted on Feb 19, 2009
These two problems are related, your engine is overheating because there isn't enough coolant to dissipate the heat. There are three main causes for coolant in the engine oil:
1. Cracked head
2. Blown head or intake gasket
3. Cracked block.
The gaskets are an easy and relatively cheap fix, the head replacemnet isn't to difficult but will run you more than the gaskets. If the block is cracked (pretty rare) you'll need a new motor because it's going to comletelyu fail sooner or later.
Posted on Oct 01, 2009
SOURCE: oil mixing with coolant
If this is a 3800, Upper Intake Plenum or Lower intake gaskets are an inevitability. Head gaskets on these engines rarely go out! Seriously, don't get duped. I am doing the job on my grand prix right now. Google it for further explanation.
Posted on Oct 19, 2009
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