Chevrolet Repair: heater 1995 gmc 1500, gmc 1500, proper flow

Question
The heater is not working in my 1995 gmc 1500 pickup 350 motor  i changed the heater core about 3 months ago  all it blows is cold air even when the motor is hot  thanks for any sugestions you may have

      Toby lodge

Answer
YOu will have to check your heater temp door in your dash ductwork.  You probably have an actuator that is stuck on cold.  Or you could have a plugged line going to the heater corethat is preventing proper flow of coolant.  Checl at the fitting on the intake.