While the A/C is on, The Jeep randomly blows HOT air from the floor vents for 3-5 mins then stops

[WranglerMan]

Good luck with that, my service tech laughed when I showed him the pm with the “case number” and to this date no one from @JeepCares has responded to me.

Trust me I have no problems taking it back over and over and have it elevated to a STAR case, I doubt one man like me is gonna cause FCA to crumble but if it’s not right we all need to complain so they will take notice and hopefully get these issues corrected.

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[mgroeger]

Same problem and we have experienced "no cool air" for 5-10 miles after first start up (engine not fully warmed). Nornal day (about 60 degrees F.) and all we can get is increasingly hot air from the dash vents. If I pull over, stop, shut off the engine and then restart, it will make cold air after another minute or two.

This is not an every-time occurence and seems to have nothing to do with outside temp. It does not act like anything is stuck...it just acts like it went "stupid". Adjusting temp to max cold does not help.

Waiting on dealer call for a different issue (part ordered), so we will write it up at that visit.

JimL

Dang! You got a whole different mess on your hands! We are getting are blasts of hot air randomly after any given period of driving. You've got a whole other mess.

 

[JeepCares]

@JeepCares I just had a call from a FCA Rep they you had contact me and it was a pleasant conversation but what I described to him with the hot air blowing he said is not normal and has a case started for me I also said I have several other issues like the battery voltage running really high, dash display lights staying on, leaking rear washer nozzle, cruise control recall any other Uconnect updates and he advised they may put an event logger in my Jeep to record things while I drive so we will see how that goes, I’m hoping that they can get all the issues addressed as I really like my JLU Sahara and hope it serves me many, many years but again we will see, thank you again for having a Rep call me to log my issues and concerns and I will report back on what the Dealer here in Katy Tx tells me.

I believe we're corresponding via private message, WranglerMan. Please continue interacting there to avoid confusion.

Thank you,

Jasmine
Jeep Social Care Specialist

 

[WranglerMan]

I believe we're corresponding via private message, WranglerMan. Please continue interacting there to avoid confusion.

Thank you,

Jasmine
Jeep Social Care Specialist

Jasmine,

I will contact you and the Rep after my service visit, thank you again for getting them to contact me.

 

[am1978]

Had this happen a second time to us, both were during highway driving at speed about 30mins into the drive—humid air.

 

[GordonZoo]

Count us in on the AC with Hot air blast feature. I don't remember ordering this or it being offered when when we ordered. Today I had to turn on the AC for the first time due to sporadic rain and my wife felt the hot air blast after about 20 minuets of driving. It shot out by her legs and I felt it too. We just got it Saturday. It felt warmer than the air from the outside like the heater kicked in. I then shared the leg vents with the forward and it got better. I've been in the HVAC/Design controls field for 35 years and this is not how a system is supposed to operate.

 

[Mjclay]

Well I picked up my Jeep yesterday from the dealership and everything else was fixed, recall done. AC problem investigated and according to the tech and the computers everything looks normal. They could not replicate the problem. So I guess we all just wait for a fix.

 

[NavyVet1959]

The easy answer to clear a reported problem from your list of reported problems is to just claim "could not replicate". As an engineer though, I will admit that these intermittent problems are the most irritating to try to address. I often amounted to looking at how reported symptoms might possibly occur and then fully reviewing every line of code and every piece of hardware that was related to that subsystem. The thing is that the primary engineers on a system are often moved to new projects after a system goes into production and you are left with support engineers that might not fully understand the intricacies of the systems, so they might not fully realize how it could develop. Hell, all it would take for an intermittent problem like this would be one variable that was not initialized in the code.

 

[mgroeger]

The easy answer to clear a reported problem from your list of reported problems is to just claim "could not replicate". As an engineer though, I will admit that these intermittent problems are the most irritating to try to address. I often amounted to looking at how reported symptoms might possibly occur and then fully reviewing every line of code and every piece of hardware that was related to that subsystem. The thing is that the primary engineers on a system are often moved to new projects after a system goes into production and you are left with support engineers that might not fully understand the intricacies of the systems, so they might not fully realize how it could develop. Hell, all it would take for an intermittent problem like this would be one variable that was not initialized in the code.

The thing is it isn't an intermittent problem. From what they are saying it is designed to occur at intervals that the computer determines. So the real question is why and how do we turn it off. The BS answer I was given is beyond stupid.

 

[NavyVet1959]

The thing is it isn't an intermittent problem. From what they are saying it is designed to occur at intervals that the computer determines. So the real question is why and how do we turn it off. The BS answer I was given is beyond stupid.

As far as the dealership maintenance department is concerned, it is intermittent since they cannot reproduce it. The engineers themselves should know if it truly is acting as designed and be able to give an explanation of the reasoning behind their design decision. If it is acting as designed, then it sounds like a suboptimal (i.e. "stupid") design.

But then again, what do I know? It's not like I've ever developed systems where the lives of people were dependent upon it... Oh, wait a minute... I HAVE...

 

[drfeli]

I believe you are correct. Now we just need proof that it exists since Jeep is playing dumb.

Does the air seem to blow from the actual footwell vents or might it come from somewhere else? Is it on both driver and passenger footwells?

mine feels like it is behind the glove box....air comes out really hard there when you open it during this phenomenon

 

[WranglerMan]

Well to my Jeep in this am for the recall and gave them a list of items to check:

AC blowing hot air randomly
Battery voltage running a constant 13.8-14.0 volts
Clicking noise in front end
Leaky rear washer nozzle
Door Gasket warped
Cruise recall
Any other software updates

We will see what they tell me, may have it more than 1 day

 

[cobra]

Here is what my service tech thinks is going on. When you have recirc on, the door to the vent is closed, when you have recirc off, the door is fully in the open position which allows the air to mix but will not allow any vent air to your feet or cabin but when the door is not fully open or closed [somewhere in between]that outside air will blow to your feet and if you open the glove box you'll feel it. So he thinks the door is periodically opening a bit allowing that outside air to blow in the cabin. To narrow this down today he unplugged the electric motor for the door with it in recirc mode to keep it from moving [hopefully]. Now i have to take it for a trip and see if it no longer blows outside air to the cabin. I think he's on to something.If so next will be determining what is making the door move at times.Hope i explained this in a way you understand.

 

[cobra]

Here is what my service tech thinks is going on. When you have recirc on, the door to the vent is closed, when you have recirc off, the door is fully in the open position which allows the air to mix but will not allow any vent air to your feet or cabin but when the door is not fully open or closed [somewhere in between]that outside air will blow to your feet and if you open the glove box you'll feel it. So he thinks the door is periodically opening a bit allowing that outside air to blow in the cabin. To narrow this down today he unplugged the electric motor for the door with it in recirc mode to keep it from moving [hopefully]. Now i have to take it for a trip and see if it no longer blows outside air to the cabin. I think he's on to something.If so next will be determining what is making the door move at times.Hope i explained this in a way you understand.

 

[cobra]

If you open your glove box and take the arm loose on the left side and drop the box down a bit you'll see the door i'm talking about. Also that is where he got into to unplug the wire for the door.

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