I am having a problem with my 2005 Grand Cherokee (Limited 5.7 Hemi) cabin heater. After the engine is warmed up, the heat will only work at the maximum temperature setting (set on the RED dot of the climate control). As soon as I move the dial up one notch it gets cold. This happens on both the manual air temp setting and the auto setting. The blower works perfectly. Any ideas what is causing this? I'm at a loss and frustrated... Thanks in advance for the help!
Thanks for the video. I had the heater core replaced last winter because it was leaking and the coolant system was flushed at that time. I would think if the heater core was clogged, it wouldn't produce heat, right? Any other ideas what can be causing heat only on max temp setting?
Thanks for your input! Do you know of a way to test the temp control to make sure that is the problem? I'm on the fence about buying a new control panel without knowing for sure. Also, FYI, I have a dual-control panel and both controls do the same exact thing... Blow cool/cold until I move the dials to max heat. Once I do that, the air out of the vents is HOT. Is it possible both controls can be bad and behave the same way?
And even though you have the dual zone like I do it still had to read the interior temperature of the vehicle which is probably the part that went bad. When it's all the way cold it only blows cold and when all the way hot the opposite when it's in those positions it's not trying to adjust temperature to a certain degree.