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Old 11-25-2009, 08:00 PM   #1
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Yet ANOTHER heater question..

Ok, I know everyone is tired of reading the heating questions, so am I. I have read post after post and checked "everything" that has been recommended. My problem is with the defrost only. Everything works until you hit defroster and nothing comes out of the center vent, but, comes out of the defrost side vents. IF I turn the speed level to low and move it to floor, the floor works and a little warm air comes out of the center defrost vent, but, if I turn it to the next speed up, you hear a flap shut, and then floor only. In Indiana, I really need the defrost bad. Thanks for any info or tips that you may have for me.

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Old 11-25-2009, 08:37 PM   #2
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That sounds like either a vacuum leak, the climate control system runs off engine vacuum, or a mechanical problem with the actuator/valve. Pull the control panel out and make sure that the vacuum lines are firmly hooked to it.

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Old 11-25-2009, 08:49 PM   #3
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Quote:
Originally Posted by 350chevrolet View Post
That sounds like either a vacuum leak, the climate control system runs off engine vacuum, or a mechanical problem with the actuator/valve. Pull the control panel out and make sure that the vacuum lines are firmly hooked to it.
Ok, I will try that later. It is weird, it was working fine and I was driving down the road and heard a popping noise. From that second on, no defrost. When you move it to defrost, it sounds as if a door is closing. When you turn it on high, it sounds like there is a lot of air movement under the dash, but, the only air coming out is in the side defrost vents.
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Old 11-25-2009, 10:24 PM   #4
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o so there was a pop associated with the start of this problem. what year is your jeep? i know there was an issue with the defrost valve/door on some of the models but i think it was resolved with the 2000 model. there was a tsb out about it, you might be able to still find it.
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Old 11-25-2009, 11:26 PM   #5
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Originally Posted by 350chevrolet View Post
o so there was a pop associated with the start of this problem. what year is your jeep? i know there was an issue with the defrost valve/door on some of the models but i think it was resolved with the 2000 model. there was a tsb out about it, you might be able to still find it.
I apologize. It is a 97 Jeep Wrangler Sport
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