Quote:
Originally Posted by SideValve
... if the water-pump were leaking it would emerge from a drain hole.
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As
Trikey says, not necessarily!
When I was helping another member in the summer we discovered that the steady drip from his water pump was actually coming from a defect in the casting!
The way around the evaporation problem is to inspect very carefully from beneath, immediately after starting the engine from cold. You're looking for the tiniest of drips.
When I had slight but regular loss of coolant it was flattened 'O' rings on the expansion tank cap.
Simon