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Just checked my 201 disc, they DO refer to the bottom tank as the overflow tank. In the work instructions they DO refer to the pressure tank as the expansion tank, referring to it once as the "reservoir", which actually I do see a lot in the owners manuals.
The OVERFLOW tank is often overlooked (as you can not look at it at all!) after a headgasket job, where there has been oil mixed in with the coolant. The job will seemingly be all done and the cooling system flushed and all seems well. Then the car starts getting oil into the coolant again so the owner thinks the job was botched, when the real problem is the overflow tan was never emptied, and actuall for what it costs should have just been replaced, as they are about impossible to clean. No cap, just a nipple where the hose from the pressure tank connects, and a small spigot which will let the coolant spill out if the overflow tank completely fills.
Gilly
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