Hi my name is Nate,

I have a 04 silverado 1500. and have been having an issue with the heat. When truck is fully warmed it i will get the heat blowing for awhile on both the driver and passenger side but that after awhile the heat quit blowing out on just the driver side and blows cooler air but continues to blow hot on the passenger side.

Would a heater core back flush solve this problem or is it a bigger issue?