How much Coolant Volume Expansion is Normal??

[Jonathan]

Thanks Jonathan that's great info. I don't suppose you could run your formula using 220˚F. I would concur that the volume expansion under Normal Highway driving temps (190-195) is about what your results would indicate.

It's a good point you brought up about the Volume difference of a stainless (Cylinder Flat Ended) tank and the plastic Hemisphere end tank. Are the Diameters of the two tanks the same or is the stainless slightly smaller?

I work it out to an additional 80 ml to go to 220 degrees F. Meaning, the expansion volume from atmospheric conditions to just about the boiling point is 0.480 litres. Still should be lots of room in the empty half of the coolant reservoir.

I have an old plastic reservoir in a tote somewhere. I'll see if I can dig it out and do some measurements to see what the capacity is.