leaking coolant

Hello, I am hoping someone can point me in the right directions.

I have an 86 Ford Aerostar, 2.8L, 5 speed, mini cargo van that seem to be leaking coolant from behind the water pump close to the thermostat location at the end of a through bolt of the water pump fastener.

I will pulling out the power steering pump to get a better look at what is behind there, but thought I would see if anyone in here had an idea of why it would be leaking in such an odd spot. I have checked the hoses and replaced the one leading away from the water pump.

Any help would be greatly appreciated.

Thanks all .. cheers!!!!

TAz