Can you give me some clues, please ?
Coolant drips about once a minute to the top of the differential pumpkin. From underneath, this old belly and eyes cannot determine where is it coming from. Somewhere under behind the alternator is as far as I can trace it, coming down the front-right of the block. Seems not coolant pump related, but could be wrong. With good light between the compressor and alternator, there is no puddle in what seems to be the valley pan.

Suggestion: Do not get old, it's the ****s. What used to be a 5 minute task becomes hours... when dare to tackle it.

 

Have you "rented " a pressure tester from an auto parts store?

 

Temp sensor hole, nipple on intake to TBH or coolant reservoir (if TBH is bypassed), maybe the water pump weep hole & it’s being blown back, or front timing cover gasket at the water pump area, upper valley gasket.

 

Thanks.
A pressure tester would tell me the same I see with residual pressure after parking. What I need to do is remove the alternator hunting for the source, but I need 20 years less to motivate, and a better weather...
Everything looks dry from above and around the pump, tbh nipple, temp sensor, valley. Is the heater core nipple at that location behind-under the alternator ?

 

The nipple is a bit lower for the heater hose (at the plastic Y connection) but it could blow up on the front of the engine for sure.

 

Keep in mind that your fan is blowing any drips to the rear.

 

Removed the alternator, found the port that supplies the heater core, circled with red, bone dry. No signs of leaks anywhere in the area.



In another session I would have to remove this belt tensioner and alternator support :
Pictures borrowed from the web :

The drip appears to come from between this pictured bracket and the head front face. Have no idea what may be leaking behind it Suggestions welcome.

 

How about this area? This is the pipe that brings coolant out of the engine to the rad.



If not, the only other possibilities in that area are the water pump to TC cover gasket, TC cover to block gasket, or the head gasket. Removing that alternator/tensioner bracket is not tough and should give you a good view.

 

On the top of the I take there is a small coolant hose pointing up.

My hose blew off of that and I couldnt find the leak right away.