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I'd noticed a gradual drop in coolant level over the last year and topped it up at regular intervals.
I assumed the small leak might be where I'd patched a radiator with JB-weld after the welder welded on bigger in- and outlet tubes.
Goes to show not to assume anything. If I hadn't removed the top cowling immediately after flight I would never had seen the bead of water at the joint the arrow is pointing to. That black thing is the water level sensor in the reservoir.
I had increased my coolant red line to 230F and briefly hit as much as 235F on flights this year (take-off and climb to pattern).
I don't think I ever found a temp rating for that level sensor -- I might have tested it in boiling water but I don't remember.
Anyhow, things are getting hot under that cowling.
Finn
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