Coolant leak under gas tank

[Ghost73]

Hey all, It's been a while since I've been on here but I have a new issue with my '73 FJ40. The gas tank sits under the passenger seat and under the tank there is a hole with what looks like some kind of rubber seal in it. After I drove around the other day I noticed coolant leaking from this hole (see attached pic of hole) onto the ground and into the back of the vehicle near the rear heater on the passenger side of the vehicle. I can't figure out where this leak is coming from? Any ideas what this is before I throw up my hands and take it to my mechanic?

Thanks

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[Pighead]

I noticed coolant leaking from this hole (see attached pic of hole) onto the ground and into the back of the vehicle near the rear heater

I'd guess the rear heater or rear heater hoses then...

 

[bhsdriller]

only coolant that enters the cab are the rear heater lines. The front core also but it's further up and probably couldn't make it there

 

[timmyisinthewell]

As suggested by Pighead, I'd look at heat hoses first, with coolant leaking down into the gas tank well. Do you have the drain valve in your heater hose plumbing? See attached photo with valve at the bottom of the pic. Mine was a leak source on my '72.

 

[Ghost73]

I was thinking it was most likely the rear heater hose lines, somewhere. I will have to trace the lines to see if I have that valve. This is a good start for me. I appreciate the responses.