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Old 01-24-2019, 04:44 PM
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Heater only blows hot air on the hottest setting

I have a 2016 JKU with 50k miles. The last week or so I only get hot air from the vents when the temp knob is turned to the hottest setting. If I back it off one notch the vent temperature is greatly reduced, similar to if it was set in the middle. Any ideas where to start checking? I don't think it's the heater core since it blows the same temp on both sides.

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Old 01-25-2019, 10:45 PM   #2
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Do you have the automatic climate control option?

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Old 01-25-2019, 10:47 PM
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No. It's 2016 sport.

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Old 01-26-2019, 01:13 PM   #4
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I have this same issue with my 17, no climate control
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Old 01-26-2019, 02:09 PM   #5
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Quote:
Originally Posted by Canyonero02 View Post
I have a 2016 JKU with 50k miles. The last week or so I only get hot air from the vents when the temp knob is turned to the hottest setting. If I back it off one notch the vent temperature is greatly reduced, similar to if it was set in the middle. Any ideas where to start checking? I don't think it's the heater core since it blows the same temp on both sides.
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Originally Posted by Victor Ward View Post
I have this same issue with my 17, no climate control
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Old 01-26-2019, 02:09 PM   #6
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Taking a shot here, but it might be something with the calibration of the blend door? Moving the knob to the highest heat setting probably closes the door all the way, but the calibration for every setting in between might be off.
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Old 02-05-2019, 08:38 PM   #7
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I have a 2016 and have the same issue.

I have the auto climate control, but mostly have the auto feature disabled.

I only get extremely hot air with the dial turned all the way to the right. One click to the left and the air cools considerably.

Is there a way to perform a calibration?

How do you determine if it is blend door actuator or HVAC control module?
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Old 05-24-2019, 04:27 PM
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Anybody else having this issue? I haven't looked into it much more since the weather has turned warmer. I also noticed this seems to be happening only with the defrost and the dash vents. The floor heat stays warm when I turn it down only a few clicks. Even on mixed (floor/defrost) the floor will blow hot while the defrost is a lot cooler.
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Old 05-25-2019, 12:11 PM   #9
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At first it sounded (if it's not the heater core) like the blend air door actuator, 68018109AA. The problem with the floor getting more heat than the other vents is a different issue, probably the mode door actuator. Same part number, other side of the box. Can't tell if they both failed at once or if they were a few months apart.

It could be the control head, it could be the whole housing, but if it's a hardware problem it's most likely one (or 2) of the little motors mounted on the outside of the unit. The door actuators are a popular problem. Not that they're bad or anything, but years ago they started doing a better job on the units themselves and the doors inside do much better than they used to- so there's less likely to be a problem, and if there is one it's more likely to be a part that's easy to get to so you don't have to disassemble the whole system.
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Old 05-25-2019, 01:44 PM   #10
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Typically the vents at your feet blow warmer than the ones in the dash. Iíve noticed this on multiple vehicles at multiple temp settings. This is because warm air rises, so itís a way to better regulate the cabin temp.

If Iím not mistaken too, you want cooler air blowing at the windshield on defrost mode vs warm air, it helps keep the window from fogging more and evaporates the moisture.
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Old 05-25-2019, 09:00 PM   #11
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I had this problem as well, the fix for me was to replace the head unit. Pull the one you have, grab the part number off the back and if I remember right it was less than $100 new.
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Old 05-26-2019, 10:49 AM   #12
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With auto climate control one notch off high temp puts it at the temp indicated on the knob so it will be significantly cooler to the touch.


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Old 05-28-2019, 11:24 AM
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Maybe Ill pull the head unit and try that. I do not have auto temp. Backing off one notch off the hottest setting drops the air coming from the vents and defrost to a temp as if I put it in the middle or slightly to the cool side. Floor temps function as they should.

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