Hey, that's a nice diagram. By the way, the image in your post didn't work out -- probably because the URL isn't the image directly, but rather it's an Imgur web page which includes the image. That would have to be linked with the URL tag instead of IMG. I only found it because it was included in the e-mail (it's http://imgur.com/ZEsFlNM
, for the benefit of others who may come along wondering). Somewhere we have a thread about how to embed images successfully -- sometimes it's tricky.
When I wrote that earlier post I was working from memory, having last laid eyes on those valves a week or two ago. Anyway, valve 1 in the drawing is the one I tried to describe being up in the area near the exhaust downpipe etc.
The access panel in the middle of the rear bench is useful mainly for cylinder valve adjustments, cylinder head removal, in-frame engine rebuild, etc. You won't be able to reach any coolant valves through there.
That said, the drawing is confusing: it shows valve 2 off the back of the engine, as if it were above the transmission. It isn't. I can't figure out why they position it there in the drawing, but the text beside it mentions the transmission oil cooler. That's the small "radiator" (about 1 foot square) about two feet behind the left rear wheels. Valve 2 will be somewhere in that area.