I'll let more experienced Vette owners answer the what to watch for. As far as the cooling system having pressure, that's what the caps for. By keeping the system under pressure, it prevents the coolant boiling over at lower temps.
Maybe he should wait until the temperature gauge reads about 210 before pulling the cap off. ha ha
There will be pressure - lots of it - and a lot of very hot coolant spraying out all over you the hotter the car is. People get seriously hurt by doing what you did. Count yourself lucky. NEVER remove a radiator cap if the car is hot or warm.
To start with, I suggest you read the owner's manual from cover to cover. Most never do, because they already know how to operate a car, but if you are pulling radiator caps off and don't know there is pressure there, you'd better start on page 1.
It goes along with the lawn mower warnings - Do Not Place Hands under Here when Running.
Let's see, it cuts grass, but it won't hurt my fingers????
It is a shame- it would help clean up the gene pool if there weren't so many warnings to protect the, well how do I get "politically correct" on this, stupid. The dumb and dumber continue to grow and breed and make even dumber ones.
I was thinking he might know enough to think the "pressure" was bubbles flowing in the coolant (ie head gasket blown) but if he knew bubbles flowing was something to look out for, he should already be aware of a head gasket causing it. :-)
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