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Old 12-15-2010, 05:34 PM   #1
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JK Heater issue

Does anyone else have a heater issue with their JK? I am not getting heat out of the drivers side vents. I'm getting some warm air through the passenger side. The dealer has changed the coolant, heater box and heater core, but still no help. They are lost, any ideas?

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Old 12-15-2010, 06:05 PM   #2
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Try posting this over in the JK section, you'll get better responses.

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Old 12-15-2010, 06:28 PM   #3
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Originally Posted by Smpelot View Post
Does anyone else have a heater issue with their JK? I am not getting heat out of the drivers side vents. I'm getting some warm air through the passenger side. The dealer has changed the coolant, heater box and heater core, but still no help. They are lost, any ideas?
that sounds weird. im not sure how to help you answer this question. but if you post in the JK section im sure they will have some good answers for you. good luck.
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Old 12-15-2010, 08:13 PM   #4
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That's usually a blend-door problem...part of the heater box. If they really did change it, it should have solved the problem.
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Old 12-15-2010, 08:27 PM   #5
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It's a logic problem: If you fixed the source, the problem must be in the ducts themselves. How about a blockage in your driver's side duct? Has anyone tried to to snake it?
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Old 12-15-2010, 08:55 PM   #6
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It's a logic problem: If you fixed the source, the problem must be in the ducts themselves. How about a blockage in your driver's side duct? Has anyone tried to to snake it?
They checked all the ducts, heater core and heater box. Everything is fine there. They found some sludge in my coolant and they are in the process of flushing it. Of course they are trying to charge me for it. My jeep only has 15000 miles on it. How could I have gotten all this sludge in there?
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Old 12-15-2010, 09:05 PM   #7
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If that blend door is working correctly, I don't believe that a partially clogged heater core will cause heat to not come out of only one side.
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Old 12-15-2010, 09:18 PM   #8
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I am used to heater issues living where I do. Even the slightest heater issue shows itself at -50.

You say you get warm air out of the passenger side. How warm? They are sure the core is getting hot enough? Do you have good pressure from the fans? If that is true then it has to be a blend issue. I am not positive but I believe it is cable operated.

I am new to jeeps so I am far from an expert on their heating systems. Being in the troubleshooting/repair industry I know we get parts all the time that are DOA. I would at this point be trying a few more easy things and then I would throw another airbox at it. I would attempt to prove it defective first.

I wish you luck friend. Heater problems suck. When ya need it. I hope they figure it out for you. I am a bit worried because I would never tell the customer I didn't know what to do.
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Old 12-15-2010, 09:25 PM   #9
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Quote:
Originally Posted by Dogzilla
If that blend door is working correctly, I don't believe that a partially clogged heater core will cause heat to not come out of only one side.
If it's cold enough and the core is clogged it can cause cold air from the drivers side and barely warm from the passenger side because the air in the drivers side vent tubes has a longer way to go and can cool off. Especially if the fan is on high. It can cool what heat the plugged core has off too much. This takes place in more extreme cold with poorly flowing cores.
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Old 12-15-2010, 10:02 PM   #10
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If it's cold enough and the core is clogged it can cause cold air from the drivers side and barely warm from the passenger side because the air in the drivers side vent tubes has a longer way to go and can cool off. Especially if the fan is on high. It can cool what heat the plugged core has off too much. This takes place in more extreme cold with poorly flowing cores.
Good points. I reread the original post, and see that it does indeed say that "some warm air" is coming out the passenger side. The Jeep is capable of putting out some serious heat, so it sounds like maybe the sludge might just be holding the heat back.
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Old 12-15-2010, 11:20 PM   #11
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Originally Posted by Dogzilla

Good points. I reread the original post, and see that it does indeed say that "some warm air" is coming out the passenger side. The Jeep is capable of putting out some serious heat, so it sounds like maybe the sludge might just be holding the heat back.
My jeep has a great heater. It has currently passed the -40f test with flying colors. It runs me out. We will see how it does a few years from now but I am impressed at this point.
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Old 12-16-2010, 06:23 AM   #12
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Quote:
Originally Posted by Smpelot View Post
They checked all the ducts, heater core and heater box. Everything is fine there. They found some sludge in my coolant and they are in the process of flushing it. Of course they are trying to charge me for it. My jeep only has 15000 miles on it. How could I have gotten all this sludge in there?

This part is pure BS and you should not let them charge you for it. First of all if there is "sludge" after 15K then you have a serious problem somewhere or someone Effed with you Jeep.

They already changed your heater core and your coolant. There is no way you have a sludge buildup and changing the coolant with only 15K. Was there any change in the temperature after changing the core? Did you start to get heat on the passenger side?

I don't know what the "heater box" is, but if it's not an issue with the core or the duct, could it be the dial that determines hot/cold?
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Old 12-16-2010, 06:31 AM   #13
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I have a 07 been to the dealer over heat problems from day one. They say they have changed everything still no help, good warm air on passenger side and cold as ice on the drivers side.Now its out of warrenty and i cant figure it out.
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Old 12-16-2010, 06:40 AM   #14
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I have a 07 been to the dealer over heat problems from day one. They say they have changed everything still no help, good warm air on passenger side and cold as ice on the drivers side.Now its out of warrenty and i cant figure it out.
You shold have stayed on them until it was fixed. Mine is like a blast furnace from hell.
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Old 12-16-2010, 08:10 AM   #15
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Like Daggo says......if everything is working as it should, you could fry eggs with the heat from the thing.....on BOTH sides.
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Old 12-16-2010, 02:57 PM   #16
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I've read some posts about this on another forum, the problem that they found was in the selector knob, the doors weren't operating correctly.

If the dealer changed out "everything", then there's a blockage in the ducts, like others have said, the JK heater is a blast furnace.
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Old 12-16-2010, 03:52 PM   #17
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That makes sense. Do you know if they're electronic or vacuum or wire controlled?
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Old 12-16-2010, 04:09 PM   #18
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That makes sense. Do you know if they're electronic or vacuum or wire controlled?
I don't for certain, but it "feels" more mechanical to me.

I'm gonna have to find out.....
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Old 12-16-2010, 04:11 PM   #19
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Originally Posted by YJjeep
Try posting this over in the JK section, you'll get better responses.
This is the JK section.
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Old 12-16-2010, 05:28 PM   #20
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This is the JK section.
But when it was orignally posted it was in the WF help and support or i was just completely in space when i read that.
lol
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Old 12-18-2010, 02:40 PM   #21
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Well i flushed out the heater core and now my heat works great, i dont know why the dealership could not fix that but dont matter now its fixed. I appeciate the help.
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Old 12-18-2010, 02:47 PM   #22
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I second that the JK's heater is no joke. Mine cranks out fire from every vent in less than 5mns after cold starting in 20 degree weather.
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Old 01-03-2011, 08:36 PM   #23
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Well, the dealer flushed my coolant five times, changed the heater core,radiator, and thermostat. They said there was still some left over castings from the engine block. Should I be worried that my engine block is worn more than normal?
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Old 01-03-2011, 09:25 PM   #24
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Well, the dealer flushed my coolant five times, changed the heater core,radiator, and thermostat. They said there was still some left over castings from the engine block. Should I be worried that my engine block is worn more than normal?
you could verywell have a pluged heater core so just remove both heater hoses and put a garden hose on 1 side and turn the water on high fo 5 minets and let it flow on the ground out the other side and then put the host on the other side and flush for five more minits on the ground. Then hook both hoses back up and make sure they are on the proper side as jeep may have them bckwards. Go to dealer and look at another jeep to make sure and make sure yours are the same. Heat may now work as new. Only problem is u must have a debre problem as this is a rare problem on most vehicles. If this fixes the problem i would do a complete cooling system flush and replace with all new coolant.

















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Old 01-03-2011, 09:31 PM   #25
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if you're still under warranty take it to the dealer and tell them you don't want it back till it's fixed. it's that simple. you may be out a vehicle for a while, but that's why we have warranty coverage.

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