Question about 1995 Chevrolet Lumina
Sounds like we have to things to address. The disappearance of antifreeze and a loud knock. So first the antifreeze. How much are you using? In other words how much are you topping it off with and how often? Now low antifreeze can make the engine overheat and knock from this. If you are absolutely positive that there is no head gasket leak and you are not loosing any antifreeze slowly out of the radiator cap or overflow reservoir then I would check for an intake manifold gasket leak. Often The problem with many mid "90s" vehicles is that GM had just introduced Dex-Cool antifreeze and it literally ate at every seal it came into contact with. A Google search will show you the billions in lawsuits they faced because of it. I can't tell you how many warranty repairs I did because of this.
Now if you car is continually running low on coolant and is heating up they it will ware on the rods and pistons and other engine parts. From what you have explained it does sound like you either snapped a rod somehow or dropped a valve. Unfortunately for this there is no other way to find out other than to pull the head and have a look. If you can fix this then it will be cheap enough parts and your labor. If you need to take it for a mechanic you will want to weight your options. I am very sure in my diagnosis. Anytime the engine knocks like that it is never good and you have to look inside to see how much damage is done. If you have any other questions feel free to ask.
Posted on Apr 07, 2011
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As for oil not milky , this could still have a crack or bad headgasket just going through the exaust port in the head. As for the loud KNOCK may be your oil pump quit working, Really hard to say, Hopefully it's not ready for overhaul. Best of luck to you.
Posted on Apr 07, 2011
Testimonial: "thank you for the info. i will check it out. :)"
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Posted on Jan 02, 2017
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