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Unread 01-17-2013, 03:36 PM   #1
MusicMaverick
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2010 Heater Not blowing Hot Air

Its luke warm at best... Thankfully, it has a couple months left on the bumper-2-bumper warranty, so its over at the dealership now. They just called and said they looked and couldn't find anything wrong with it...No coolant leaks, thermostat is fine, etc.... So now they want to keep it until Monday, and tear the dash apart to see if the internal doors might be stuck.

Thought I'd throw it out to the community and see if any JK owners have had similar issues...

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Unread 01-17-2013, 03:52 PM   #2
GPV
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http://www.jeepforum.com/forum/f96/t...vents-1460802/

On the plus side you aren't alone.............

There have also been reports of sand from the casting left inside the block eventually plugging up the heater core.

Best of luck.
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Unread 01-17-2013, 04:43 PM   #3
Godholio
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Why do people keep throwing out the heater core idea? His heater is blowing hot air, but it's not getting to all the vents.
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Unread 01-22-2013, 11:08 AM   #4
MusicMaverick
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Confirmed... Its the heater core... But the reason it went bad is casting sand in the coolant... They're going to flush the system and replace the heater core.
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Unread 01-22-2013, 04:13 PM   #5
jwmbishop
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The self check on the heater is REAL simple. remove the glovebox door (squeeze the side stops inward and lower it).

Then cycle the heater defroster ac etc and see if the diverter is working. On heater mode you should NOT be able to hold your hand up next to the core without a five second discomfort from too hot - if warm, not enough coolant flow. If hot but the heat does not come out - motor controller switch etc for the diverter.

My 11 froze the motor at ~7k miles and dealer replaced under warranty - after I spent an hour playing with it and scalded my fingers twice. Yep - Im a slow learner....
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Unread 01-22-2013, 04:26 PM   #6
442Wrangler
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Quote:
Originally Posted by jwmbishop View Post
The self check on the heater is REAL simple. remove the glovebox door (squeeze the side stops inward and lower it).

Then cycle the heater defroster ac etc and see if the diverter is working. On heater mode you should NOT be able to hold your hand up next to the core without a five second discomfort from too hot - if warm, not enough coolant flow. If hot but the heat does not come out - motor controller switch etc for the diverter.

My 11 froze the motor at ~7k miles and dealer replaced under warranty - after I spent an hour playing with it and scalded my fingers twice. Yep - Im a slow learner....
x2. If the core is blocked, no heat will come through it at all.
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Unread 01-22-2013, 09:05 PM   #7
wranged
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2010 Heater Core JKU

Just had mine replaced under warranty. Driver side was blowing lukewarm air at defroster and foot well. Dealer added a "solvent" in the coolant to run for a week in an attempt to dissolve whatever is clogging the cores. No dice!! Took it back and they replaced the core. All is good now and just in time for CCCOLD weather in PA.
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Unread 01-23-2013, 07:11 AM   #8
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Yet another case of a dealership that can't think...

There is ONE heater core. If any part of the vehicle is getting hot air, the problem isn't the heater core!

You've got a blend door sticking somewhere. They probably broke it loose moving things around. I hope the problem doesn't come back, because they didn't fix it.

When did mechanics become idiots? My dad did this for 30 years and I did it for four. No one thinks their way through a problem anymore.
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Unread 01-25-2013, 05:04 PM   #9
MusicMaverick
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Quote:
Originally Posted by jstrubberg View Post
Yet another case of a dealership that can't think...

There is ONE heater core. If any part of the vehicle is getting hot air, the problem isn't the heater core!

You've got a blend door sticking somewhere. They probably broke it loose moving things around. I hope the problem doesn't come back, because they didn't fix it.

When did mechanics become idiots? My dad did this for 30 years and I did it for four. No one thinks their way through a problem anymore.
Well, they replaced the heater core. It works great now... I think that was the issue. The heat was progressively getting worse over time, by the time I brought it in, it was almost non-existant.
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Unread 01-25-2013, 07:41 PM   #10
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If the air was lukewarm at all the vents, then it's entirely possible that the heater core away the problem. If, as you said, it was only the drivers side, then replacing the core didn't do a thing and the issue will likely return.

There is one heater core. It feeds every vent in your vehicle. You cannot have two different temps out of the vents and have a heater core issue.
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Unread 01-26-2013, 09:12 AM   #11
wranged
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I always understood that there is one heater core and it did not make sense to me that the core was the problem. All I know is that, according to the work order, they replaced the core and a switch and I now have plenty of heat. Perhaps the switch fixed the blend door.
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Unread 01-26-2013, 09:11 PM   #12
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Same problem with mine. Just had it fixed. Heater core and cooling system flushed about 3 times. That did it. Now I'm toasty again.
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Unread 04-24-2013, 09:28 AM   #13
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Bump for an old thread, as I'm running into the same issue with our 2010.

nickmonaco, you said a bunch of flushing took care of it? (Our warranty just expired )

Anyone have instructions on how to flush the cooling system on the JK? I've done it on TJs, anything different?
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Unread 04-24-2013, 06:17 PM   #14
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I was having this problem with my 2008. I discovered after smelling antifreeze that I was loosing coolant but I couldn't see for the life of me where I was loosing it. One day jeep temp got scary hot and heat started blowing ice cold. Got out and heard hissing. I had a pretty decent coolant leak on the front passenger side where the lower intake met the head. I replaced the coolant but then had airlock and kept having the temp go up and loss of heat. Drove like this until I could address it. Had the intake gasket replaced today to the tune of $597.00. I'm glad I had the 4x4 place do it because a bolt broke in the motor and needed to be drilled, it would have been a giant headache for me.
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