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Old 08-22-2011, 02:01 PM
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JK heater problem

2008 JK unlimited, my a.c works great but when adjusting the teperature it stays full cold and hen using the heater it blows luke warm air. any troubleshooting steps before i tak eit to the dealership would be great. I have read about a blend door and heater box from other threads but dont know where these item are located im my jeep.

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Old 08-22-2011, 06:28 PM   #2
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If its under warranty, let them deal with it.

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Old 08-22-2011, 08:57 PM   #3
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Yea, if you babi is still under warranty let them do it. Use it while you still have it.

But to answer your question: The heater box is behind the dash which is also within a plastic housing. To get it out, you need to remove the dash & the housing. You'll also need to drain the coolant & evac the freon.

Some vehicles you can actually get these out without removing the dash/housing. Done this on a nissan once.

The blend doors...well... I will say they are probably run by an electric motor. WHich you can get to without removing the dash/housing. Just going to be a tight spot. I'm not sure on jeeps since I really haven't done much work on jeeps besides changing oil on wrangler. The liberty I've done more too.

It could be a blending problem. Could also be the heater core has air in it. Did you recently change the coolant? If you did & did not bleed the system right, the heater core has air in it.
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Old 08-22-2011, 10:56 PM
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Thankyou for the responses, I have not changed any fluids besides the oil and unfortunately i am just out of warranty at 39300 miles.
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