okay, this one has me baffled. 98, 3.0 liter 194k, coolant is overflowing
out of my reservoir tank. Not doing it all the time. maybe once a week, seems to do it when I am coming home from work and stop at one or 2 places on the way home. fluid level is correct. it will go 5 or 6 days and not leak a drop. it was pouring out yesterday. don't have a clue what to check.
changed water pump about 6 months ago, but I have done that about 4 times on this car, so I know how to do it, wondering if I got a bad one. but cooling fans are not coming on when overflowing, but they are working fine.
could i have a blockage.

Any evidence of a true overheat? Might try a new rad cap and/or thermostat.

no signs of overheat, just coming out of overflow tank. tank is at minimum cold. oil looks okay, no white smoke yet at least.

Does your ASD relay allow the fans to run for a short period after shut down.
This used to be the case but I'm unsure about this vehicle. Watch this as it could be where your problem is located.