Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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What are the details on the engine? Is it stock?
Can you hold a piece of paper opposite of the fan on the radiator and tell me if it is pushes or pulls the paper?
Are you confident you do not have a head gasket issue?
Does your state require emissions testing?
If yes I would seek out a shop and explain you need the HC read out of the radiator. They should understand what you need. Explain you need to rule out a head gasket problem. Once they give you the readings here is what to look for.
>40ppm indicates combustion is entering cooling system. Minor problem at this point some radiator sealer should correct this problem.
> 200 ppm indicates immediate service required.
There still is a chance that you could find a shop with a gas analyzer. I would definitely start with finding a shop with a gas analyzer as this could determine your problem easily. otherwise it can be a teardown situation.
Did you try the paper on the radiator opposite of the fan?
That is my advice. I will be happy to assist further. This is just a start here kind of suggestion. You need to rule out a few things before we go further.
The chemical is a good start. Unfortunately it takes 1200 ppm to make it change color and 200 ppm signifies need for immediate repair. SO if it changes color it is definitely needs repair. If it doesn't change color it doesn't mean it isn't in need repair.
My recommendation if you cant find a shop with a gas analyzer have a chemical test done or buy a chemical test at the parts store. Just understand this doesn't mean its not broken.
Why did you replace the water pump? was it overheating before you replaced it? Is it possible the pump is running backwards?
OK. I am going to ask you to destroy a thermostat, destroy an old one if you have it. can you remove the thermostat completely and cut the inside out. What you will end up with looks like a washer. Place that where the thermostat goes and see if it still overheats.
Also try running the water pump with the thermostat out and see if it flows.
My concern is you have an internal restriction in the block or a blown head gasket or plugged intake. Unfortunately this means tearing the engine down and inspecting.
Ok. let me know if you need further assistance
What size radiator do you have? Is this a high horsepower car? Where do you have timing set? What is timing at 3000 rpm?
Hello, I have not heard from you in a few days. Do you still need assistance? I also noticed you haven't left a rating. I have assisted in good faith and am only compensated when you leave a positive rating. Please let me know if there is anything else you need to leave a positive rating. Conversations can always continue after a rating is received.