Blower on but no heat

You either have a stuck blend door (remaining open to the AC evap coil and not heater core) or you have lack of coolant flow to the heater core. Check the coolant level first, if it's low can prevent flow to core. Then check coolant and/or cooling system aren't frozen. (too much water in the coolant mix can leave it prone to freezing solid). After the engine gets up to temp squeeze the heater hoses, they should feel warm/hot and feel pressurized. If not try warming up the radiator externally by parking it inside where it's warm or hitting it with a heat gun.

replaced blender door 2 times car does not run hot ac works still no heat.