okay, so to the least this problem is very annoying. To begin my truck is a 2001 ram 5.9 4x4 offroad.
The problem: I turn the defroster on (either heat or cold) and it switches to either one randomly. If I put it on cold, it goes to cold for a minute or two then switches to hot by itself. It mostly goes to hot when I brake. However, the cold is really cold, and the hot is really hot. It just cant make up its mind I guess between the two. :4-dontknow: It has been doing this for about a year now. I just never used the air or heat til recently.
Within the past 2 weeks it has started smoking alittle through the vents(no matter what position I have the selector in) I can smell engine coolant, so I am thinking my heater core is either plugged or maybe leaking somewhere. I did check the carpet on the floor and cannot find any wet spots.
On a side note; I did replace the radiator about a month ago.
I have also heard about the blend door axle breaking, causing the door to not stay open or closed. any help is greatly appreciated. thanks guys