89 90hp not pumping water correctly.

[Backchannelmako]

My 89 Evinrude 90hp is not pumping water correctly. I changed the impeller first, then the impeller housing. After that failed I used a whole different lower unit. I also removed the thermostat to eliminate that as part of the problem. I am getting water flow from the indicator hose (which I believe tells me the lower unit/impeller is doing its job?) but I am not getting any water through the thermostat or heads. Any ideas what might be causing this or what I should check next? Thanks.

I'm just getting steam out of the heads and thermostat.

[boats.net]

May have to pull heads and clean water p***ages.

[Backchannelmako]

Does the water come down from the heads into the thermostat, or up from the thermostat into the heads?

[Backchannelmako]

Got her pumping! I think I had a pretty bad clog. Thanks.