Radiator expansion tank

I

Ianrhall

Senior Member
The rad on my 53 v8 has an aftermarket plastic expansion bottle connected to the overflow pipe. I managed to loose the cap for it today😕 Thinking of either removing the bottle or perhaps fitting something neater. What is the idea of that bottle? Has 2 markings, hot and cold
Ian
 
Those are level marks for hot and cold. Water of course expands and contracts with heat and cold.
 
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