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TOPIC: Coolant level, goes above max, and then below min

Coolant level, goes above max, and then below min 1 month 3 weeks ago #1331

Hello, everyone!



¿Is it normal, that coolant level on the reservoir, goes above max, (it would overflow if there was no cap)?

Then it goes below min.

¿It sometimes show some little bubbles or froth, is that normal?

Could these be indicators, of something I should worry about..

The car has new radiator, cap, thermostat, the water pump is ok.
But I am not sure about the radiator quality.

The car seems to be overheating, when opening the hood you can feel extreme heat.
But the temperatura gauge shows always, in the middle.

Last time the car overheated, first, it blows hot air inside the cabin, even though a/c is on coldest.
And then the gauge went to red.
Could somebody please, tell me why is that?

This time, is happening the same, it blows hot air inside the cabin, even though a/c is on coldest.
But the gauge doesn’t go up. When opening the hood, you can feel extreme heat. Another person who has the same car. We left them both, side by side. Turned the engine on for 90 min.
The one with the problem, does what I told.

The other car keeps the coolant level on max all the time. And it is cold inside the cabin.
No extreme heat when opening the hood. Of course you may feel heat, but normal levels of heat.


Yesterday, the coolant reservoir was below min.
I filled it up, till max. Closed the cap.
Turned on the engine.

When I rev the engine, the coolant level went up.. It would have overflowed, if it was open.
¿Is that normal?

(Volvo S40 engine B4204S2)


Thank you very much for your help.


I forgot a detail.
A few days ago, I parked the car, left it all night resting. The coolant level was between min and max.
The next morning, I tried something.
The coolant level was above max.
I opened the cap.
Turned the engine.
The coolant, was making, waves. Like when you throw a rock on water.
Then it started to go up, and it overflowed.

The car didn’t used to do that before.

What do you think?

Thanks again
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Last Edit: 1 month 3 weeks ago by luis.balstad. Reason: Forgot a detail
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