1990 4Runner coolant mystery (1 Viewer)

Joined
Oct 22, 2003
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4,110
Location
Latitude 58N or 19N
If I top off radiator a leak develops somewhere in the vicinity of water pump area. It’s not dependent upon pressure in the system either, can occur when engine is cold/not running. Once coolant level drops to top of fins the leak stops. I finally replaced 30 year old radiator recently and it made no difference. Ditto with water pump and timing belt. Any idea what’s going on?
I can apparently live with it since temp never climbs past middle of gauge, no overheating. Just weird.
 

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