So, the passenger heating core seems to get very hot, all the time. Is there supposed to be some kind of cut-off to cut the flow to it in hot weather? Seems to be kinda nuts to run it that hot when it isn't being used at all.

 

I`m no expert on this but my truck would do the same thing, but on both sides. I just turn the temperature setting down to like 68 degrees on both sides and then shut it off. It helped mine.

Bob

 

Ajh,
What year is your truck?
Some people by-pass the system during the summer by removing the heat hoses and joining them together.

 

It's an 03, I'm wondering if there's a solenoid in there or something that's not working right. I did finally manage to find my electrical fault yesterday and repair it. I'm not convinced it was me who introduced it either, it was a cut inside the heavy plastic covering on the passenger side in the back and fairly close to where they worked when installing the car starter. Now I just need to re-wire some of the accessories and the started but an aux fuse panel and relay go in first so I can independently fuse the various systems.

 

There is no solenoid causing your problem, the blender door/motor is not work, which is common , and that is what is causing your a/c issue.