I thought I had a blend door issue, I removed dash and checked the three blend doors, the only one I am having a problem with is the one at the bottom where air blows out at feet. I do not have any heat, I thought I have a blend door issue because it would not blow out at my feet. I have no heat, I can put it on def, vents floor and it only blows out cool air, 2003 Ram QC 1500 4.7L I checked my raditor and the over flow is full, temp gauge goes just below the 1/2 way mark. Any ideas?

 

is coolant flowing through ur heating core? maybe the switch that opens and closes the valve for the heater core is stuck or broken

 

How could I check that?

 

honestly i have no idea. i have only owned my ram for a few months. i know my way around a truck but not this truck. id first start with buying a Haynes manual at auto-zone. the book will show u everything about your truck and how to fix everything including how to check the heater core

 

Do you have ANY heat at all anywhere? If so then the heater core has hot coolant flowing through it

 

No heat at all, cool air all the time now.

 

sounds like hot coolant isnt flowing through the heater core. so its either the *** that operates the valve to open and close or its the valve its stuck/broken.

 

ha the heat in my wifes truck only works if she is moving, stop at a light and it goes cold

 

There are two hoses going into the fire wall just left of the motor. Let the truck get warm and feel these two hoses. They should be pretty hot. If not then the heater core is clogged and needs flush.

 

Both Hoses are hot. Checked it out this weekend, and what will happen is when the truck is warm(water temp) when you turn on the heat thru the vents it will blow out hot air, then it will turn cool. all blend doors operate fine took dash out and none of the doors broke