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Questions,
When you had the boiling & bubbling was the car running? In like, you pulled over and looked under the hood?
Did you hear it bubbling or crackling? That would say it has a sticking or stuck thermostat to me.
What is your temperature gauge saying or do you just have idiot, too late, lights on these cars?
You are stating that, When you got home, you parked to let it cool and you later had coolant up in the reservoir.
So your saying Water level is normal before the drive and then it goes low with action in the reservoir.
The coolant is holding there or coming back to normal level between the minimum and maximum lines.
This is where it’s strange.
You are have no mention of needing to replenish or top off the coolant system over any short period of time.
No mention of seeing coolant on the ground.
This is summer time so you should Not see water vapor or steam at the rear of the car’s exhaust system or it is a problem.
If you are, then a leaking head gasket or a cracked head could be putting exhaust gases into the coolant reservoir.
The coolant level has to be getting lower in this scenario.
When you said you had the system vacuumed out is something new to me!
Did you see the person use a small clear cylinder device with a colored liquid inside.
If so, he or she was performing a check on the engine block for escaping combustion gases.
It would have a hand squeezed bulb on it that pulls a vacuum above the sensing liquid to bring out combustion gases.
If so, that where you got the idea of vacuuming, I hope?
He wasn’t vacuuming the air out. Cute idea, but that isn’t necessary. (:-)
The coolant reservoir is placed, on purpose, at the highest level in the system it can be.
Since air is lighter than water, it will rise up to that point and the cap on the bottle vents out any excess every time the system is reheated up. It is self purging system over time.
As air leaves coolant will replace it up to a point.
On systems that vary from this are where the radiator cap allows both water ant air out to go into a tube that is submerged into a catching bottle reservoir.
The radiator is filled up completely so the system is full of water all the time. As that coolant expands it is expelled and drawn back as the coolant contracts backwards.
You must keep that tube to that bottle reaching near the bottom and submerged in coolant level.
Otherwise, you can get air back into the system.
The idea is to keep gas bubbles away from the cylinders walls for better cooling efficiency.
Since it’s the ingredients of water that carries the most heat.
You don’t ever want to see steam or hear boiling, anywhere!
The system is to be held under some pressure to utilize more of the heat removing quality per pound of it circulating.
Don’t lose it!
Phil
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