Question about 2001 Chevrolet S-10

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2001 chevrolet blazer 4.3 liter engine leaking antifreeze

I can't even see where the leak is coming from. somewhere on the passenger side rear of the engine. Sometimes its a few drips sometimes it pours out. I have 151,000 miles on it. I have changed the radiator, water pump heater and radiator hoses. I don't think it's the heater core because there is no leak into the engine compartment and I don't smell antifreeze in the car.

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  • JOE305 Dec 14, 2008

    My leak is an anti- freeze leak not an oil leak.Iv'e been told it could be a freeze out plug.I don't know where they are located or how many there are on my chevey 4.3 liter vortec engine. I have replaced all the components of my cooling system except the heater core. My leak is out side of the car not in the passenger compartment.I've been on line looking for a diagram of the engine but I can't seem to find one.

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Have you checked the hoses around the thermostat? The thermostat it directly on the engine and usually the hoses around it are the ones to leak or the gasket for the thermostat has gone bad and needs to be replaced. With the amount of miles that you have you may just need a new gasket so I would go down to the local auto parts store and purchase a new one, (Should be below $30) and then let me know if replacing that gasket helps. Also, Do you know what side the leak is specifically coming from to help narrow down the problem?

Posted on Dec 14, 2008

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If this is an older vehicle, with carburetion, a ruptured diaphram in the fuel pump could cause this.
If this is a fuel injected engine, these engines use plastic fuel lines under the upper intake manifold. These lines become brittle with age and sometimes leak causing fuel to run down into the crankcase. If this happens you have to replace the lines, relatively cheap and easy fix. 

Posted on Dec 14, 2008

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It can be a few things like gearbox gasket not likely to loose the lot but i would say the main gear box seal is gone

Posted on Dec 04, 2008

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Sir,

I would advise wiping everything down real good, and even clean it if you can, so as to see just where the leak is. If yours has the oil filter up in the grill area, then you may have a leak in the hoses that transfer the oil from the engine to the oil filter, and back to the engine. These are pressure type hoses, and a tiny leak in one of them can turn into a large leak pretty quick, so I would advise looking at this area, and taking action on having it repaired before it gets out of control. Putting stop leak in the engine for oil is a waste of money, as there is nothing on the market that will work without damaging other seals. This stuff works by swelling the seal, and after some time they will all go bad, and you wil have a leak of unreal proportions. Don't put any of that stuff in your engine!!! Find the leak. Take it to a shop, and get an estimate on doing the repairs. Most all shops doesn't charge for giving you an estimate, so this will tell you what is wrong, and then you can decide if you want to fix it or not. I suspect it is the oil line assembly that runs from the filter to the engine, and this is pretty expensive to replace, so call the dealer parts department, and see how much for the assembly. Another thing that can cause a small leak is the PCV valve being plugged up. Its a good practice to change these with each oil & filter change. When one gets plugged up, it will build pressure inside the engine, and force oil out many different places on the engine.

thanks
good luck

Posted on Dec 04, 2008

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