Because it only leaks at fairly high rpm. At idle or stopped, no
leak. All the coolant dribbled out while you were driving, leaving
spots on the highway, but not the drive.
I've had several water pumps do this over the years, it's hard to see
what's going on if they don't leak out the upper weep hole, as the
coolant drains away from the bottom one pretty fast.
Peter
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