No man, lets do some diagnosing rather than just replacing stuff!
Let the car warm up and then check the heater hoses at the back of the intake, they should both be warm. If they are, then you're heater ducting is not working. If one is cold and one warm, then your heater core is blocked. If they are both cold, then you have other issues.
Let the car warm up and then check the heater hoses at the back of the intake, they should both be warm. If they are, then you're heater ducting is not working. If one is cold and one warm, then your heater core is blocked. If they are both cold, then you have other issues.