"I have both hoses coming off of the water pump. Should one come off of the thermostat housing? "

Bingo. There's the problem. To have heat you need flow. With both hoses sucking you won't get any. Yes, you need one hooked to the thermostat housing to supply heated water.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.