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Hi,
It’s never been condoned to remove the cap when the engine is hot enough to boil water!
If you use a microwave to boil water or other liquids do not break the surface violently or you can see an eruption as well! The substance is still vibrating and creating friction.
You are very lucky that the designers have changed things!
The design incorporates a separate zone indirectly connected from the larger coolant mass and not on the very top of the systems mass.
A rule was developed back on solid radiators that never even had recovery bottles on the side as a reservoir.
The caps back then got a second safety catch to stop a person from totally twisting the cap off loose in one turn. At least your threaded one cracked open first!
This all helps keep the a boil water geyser from flying out at hitting the hood and spraying all over the unsuspecting consumers.
The coolant in any system technically gets hotter just after a shut down than it would be normally. This is because all circulation stops and therefore cooling stops but the engine still has some heat generated that never got time to leave the block.
A higher Pressurized mass or vapor holds more heat within its own containment environment.
In this case, just like a food pressure cooker or the earth, with its volcanos! It’s the same!
You don’t open those either!
Its energy that would like to get out and move elsewhere, with more freedom! Don’t we all?
What is going on is a thunder storm, down in the block and that’s the noise you’re hearing. Rumbling Molecules are changing states from a pressurized liquid off into a vapor gas and then collapsing (condensing) back and banging into other similar conditions elsewhere in the coolants mass.
What I’m getting to see, from the safety of your camera lens, looks very normal to me!
If you are NOT losing coolant due to a leak somewhere, you are probably ok!
I have written here or in another thread recently, that there is a hand held tool for checking for combustion gases coming up and out of coolant.
The monoxide reacts with a liquid and changes color as it exits the coolant system from the cap opening.
The vintage ones I use creates a slight vacuum above the coolant, with a hand bulb, to draw gases up through the detecting agent. A very visual operation.
I see Today some kits are more sensitive to even detect residual gases in antifreeze.
No experience here with them.
A simple test for confidence that all is tight below.
Just watch the coolant precisely for awhile and engine oil for coolant to be safe.
The car is used but a new one can do exact the same thing! More than we ever hear about!
At least this one is past those pricey and complicated new vehicle warranties. (:-)
Sponge bath time means get closer and feel better for it!
The car quietly says thanks! (:)
Phil
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