Early 90's OMC issue

[macojoe]

My buddy just bought a boat with a early 90's 120 Johnson, replaced the water pump cause it was taking a while to pee water. But its still slow to pee?? I told him that I thought this had a thing that would not pee till the T Stat opened, but not sure? Is this the case or should he be looking at something else? After a few min of running is does pee and goes pretty good!

Thanks Guys