200 Mariner

[jobu]

Sorry for taking so long to respond but it's been non-stop rain here and the boat has been on the back burner for a while. That said, I changed the thermostats and was still getting similar results. But when I run it with the thermostats out it really flows good (and I have hardly no water pressure at my house)
The poppit valve...is this also called a diaphram?
I bought one from the local Merc dealer and he gave me a schimatic...looks like the lower right bank of block. But there is also an electrical panel there...stupid question but does this have to come off first...and also is this the poppit valve?
Also, thanks to everyone who has responded...I haven't been on in a while and forgot how helpful everyone here is!
Thanks,
Joe