HVAC System Blowing TOO HOT on Occasions

[baldphilly]

I have a 2019 Ram 1500 Bighorn 3.6L V6 with dual climate controls and have intermittent issues with the heat getting too hot and I mainly notice it in the winter when I use remote start. The majority of the time I keep my climate system set to sync for the dual zones. The outside temperature will be 40 or less and my hvac would be set to 65* and blows out 85*, set to 75* and blows out 100 *, and set it to HI and it blows out 140*. The only way I can get it to blow cool air is by setting it to LO and then it blows the 40 * air from outside. I measured the temperature using an infrared thermometer. I took a video one day while it was happening and showed it to the dealership. I have taken it in for this issue 2 or 3 times and of course each time I take it in they cannot duplicate the issue and say everything is operating as it should. Does anyone know what may be the issue? Thanks! Also, I rarely use the Auto feature on my climate controls because whenever I use it it only blows air through the floor vents and I like to have the head vents blowing. Is this normal?

 

[Brennanb82]

Mine does this as well. I figured it was one of the many glitches this truck has.

 

[ZombieSlayer]

From what the dealer told me a few months back, it's going to blow hot initially until the sensors reach the programmed interior temperature. After that it should come out much closer to the desired temp.

 

[baldphilly]

I must have random glitches in the sensors then because when it happens my systems never starts blowing cooler air during my 35 minute drive to work.

 

[Moe1962]

I've noticed mine doing the same thing this winter. I didn't notice it doing it last year. I have mine set at 70, I keep a thermometer in the drivers vent and the last time I had to heat on from a cold start, not remote start and it reached 140. I just shut it off opened the window a bit and then turned it back on. It still got up to 100 and I just kept the window cracked a bit. Figured it wasn't worth the trip to the dealer, a day off work just for them to tell me they can't find anything wrong with it and it's normal.