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Old 09-13-2012, 08:28 AM   #1
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No heat

just got an '01 TJ and when i went to turn on the heater this AM-no heat fan works fine, coolant level is good and the temp control knob is turned to heat ??

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Old 09-13-2012, 09:35 AM   #2
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You can try to flush out the heater core to see if it'll help but there's a good chance the air temp blend door or motor is not working properly. The blend door separates heat/cold from the core. On newer TJs like yours, I believe the blend door is motor driven. Motor may be out and the door is stuck on cold.

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Old 09-13-2012, 09:43 AM   #3
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i'll check the hoses- is that blend motor under the hood as well or under the dash?
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Old 09-13-2012, 09:59 AM   #4
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Blend door is under the passenger side dash.
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Old 09-13-2012, 10:01 AM   #5
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Thanks!!!
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Old 09-13-2012, 10:13 AM   #6
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You should be able to see the small motor. Take the motor off and turn on your heater controls to see if the motor turns when you play with the temp control. If not, replace the motor. If it's good see if you can manually turn the blend door(pliers?). It should not turn freely but have a stopping point either direction. Hope its the motor because I think the blend door replacement is quite involved. Good luck..
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Old 09-13-2012, 10:30 AM   #7
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Quote:
Originally Posted by Wattapunk View Post
Blend door is under the passenger side dash.
Here's a picture of the blend door motor so you know what you're looking for
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Old 09-13-2012, 11:20 AM   #8
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thanks so much-- i checked the heater hoses and they were both hot, so i'll check this motor-- is it fused?
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Old 09-13-2012, 11:43 AM   #9
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Both heater hoses might be hot strictly from how they are routed in the engine compartment. Whenever the TJ's heater doesn't work, my first suspicion is that the heater core is clogged which is usually easily fixed by first flushing the core in a direction backward to its normal flow. Then back & forth after the inital flush.
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Old 09-13-2012, 07:04 PM   #10
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how do i determine which is normal flow direction
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Old 09-13-2012, 07:17 PM   #11
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Top hose from the heater core leads out of the heater core, the bottom hose is the heater core's input side. Flush from the top port first, then go back & forth.
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Old 09-14-2012, 08:13 AM   #12
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Thanks jerry!!
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Old 09-14-2012, 09:42 AM   #13
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I agree with Jerry 200% = (as the same thing was wrong with mine) - - when I flushed - I used some CLR and water - (but only after flushing with water and compressed air first) and let it soak for a while (20 min) then flushed again using both fresh water and air pressure
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Old 09-15-2012, 04:04 PM   #14
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just pulled this motor and it had a little water in it. motor was ate up thanks for the info
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Old 09-15-2012, 04:07 PM   #15
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The motor was ate up? Do you mean the engine itself?
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Old 09-16-2012, 07:18 AM   #16
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No no the small electric motor in the blend door positioner

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