heat could be warmer!

Flush everything new coolant , 195 ther, and new rad cap .I remember one time i had an old 73 dodge truck slant 6 could never get heat change averything , believe it or not took the water pump off and if i remember three prop fins gone , was not ciculating .One thing to look for is when it is running with the thermostat open make sure it is circulating in the rad , and slants are buggers to air lock also.