Overflow Tank Question

[av8r]

At what time should there be fluid returning to the overflow tank?
I assume that it should be visible?
Thanks in advance.
AV8R
95 530i, 1975 172M

[rps1072]

Isn't it when the car is hot enough for the thermostat to open and fluid to start circulating?

[Jay 535i]

About 8.30.

Just kidding.

When the thermostat opens, I think, is when you should start seeing fluid flow.

[genphreak]

About 8.30.

Just kidding.

When the thermostat opens, I think, is when you should start seeing fluid flow.LOL, I thought it was on the strike of midnight... I doubt it can be seen too easily though, most tanks are fogged and internally covered with crap. Perhaps just make sure its topped up? I doubt the tank's feed pipe would get blocked, its the only place for the pressure to go...

[Jay 535i]

LOL, I thought it was on the strike of midnight... I doubt it can be seen too easily though, most tanks are fogged and internally covered with crap. Perhaps just make sure its topped up? I doubt the tank's feed pipe would get blocked, its the only place for the pressure to go...

Oh, I assumed he meant 'visible through the open cap'. You wouldn't see anything happening from the outside, probably.