Why is my heater blocking coolant flow? Had it blown out two times but still blocks and does not heat the inside of the truck. Any ideas?

Are you saying that coolant is not flowing through your heater core or air is not passing through?

 

When is the last time you have flushed your coolant?  Your core could become a collection point for debris floating inside your coolant system and that would block or limit coolant flow.

 

If you hare having airflow issues you ought to look at your HVAC box.  I'm not sure how the 2014 is set up but my '99 was filled with all sorts of garbage that had made it's way inside the box and plugged the evaporator and in turn restricting air from passing through the heater core.  I probably could have seen this by pulling the squirrel cage and using a flash light and a mirror. 

 

This is what mine looked like.

_{You mean looking up from on the floor. I believe someone on u-tube cut a hole in the bottom to get access to clean the evaporator. I had the evaporator blown out a couple times and the heat was much better. I am thinking this problem is inside now when I think about. I thought there would be more problems like this. Kind of surprised at that. I am moving to Florida. Just need cooling there. Thanks so much.}

Best to pull the entire HVAC case and clean it properly. The other hacks don't work but as a band-aid.

 

This one I had to pull the evaporator out and power wash with a 3,000 PSI power washer to get all the dirt out the middle. Then if I tried to clean in the truck the grass and hay would of plugged it all back up again. After I was done I got complaints from the owner that the heater was cooking him to death and had to roll down the windows to keep from cooking in the cab. 

Best to do the job right the first time.

 

 

Edited February 18, 20196 yr by Mopar1973Man

You can pull the blower out and inspect your evaporator that way.  But to change or clean anything you will have to pull the whole box.  Weather for heat or cooling you need to consider this.  In both pictures that is the A/C evaporator that is covered in garbage.  Meaning there is restricted air flow whether you are calling for cooling or heat.  It isn't as bad as job as most people think and it will make a HUGE difference.