No heat

Check the oil to see if it has gone milky, if not remove the radiator cap start the engine, see if it bubbles. I say this because you may have a blown head gasket. if all ok cheak the heater matrix.
hope this helps

It may be a blown head gasket or the heater matrix blocked. an easy way to find out cheak the oil if it is a milky color then its head gasket. also remove radiator cap start the engine if the watter bubbles over this also could be the gasket. hope this helps.

Check out your heater core or it could be ablown head gasket also.

It could be a stopped up heater core. You could try this it might help. Check and see which heater hose has pressure you can do this by removing both heater hoses and starting your motor. Then hook that hose to the opposite side of heater core and leave other hose off. Start engine this will backwash core. Turn motor off and reassemble hoses and fill up radiator. Give it a try. good luck