my car blower is working fine, and i have the car warm, but for some reason its only blowing cold air(and yes, i have it set on hot, before someone makes a gay comment)..could it be anything else besides my heater core?

 

1. Water bypass valve before heater core inlet under hood not opening.
2. Temp control not actuating air mixture door in blower housing.
3. Heater core restricted.