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Old 02-05-2013, 03:12 PM   #1
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Odd sound when i shut off the heat

Hey all. Just bought a 2013 jku. When I shut off the heat I hear a noise almost like something is closing up. Do jeeps have a mechanism to block dust from getting in when the heat isn't being used. It def seems like it's supposed to be happening just curious

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Old 02-05-2013, 03:31 PM   #2
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Originally Posted by Kellar4537
Hey all. Just bought a 2013 jku. When I shut off the heat I hear a noise almost like something is closing up. Do jeeps have a mechanism to block dust from getting in when the heat isn't being used. It def seems like it's supposed to be happening just curious
Just from shutting the blower off? I don't ever hear anything unless I switch from one position to another like going from the windshield to the floor or something like that. Sorry not very helpful...

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Old 02-05-2013, 03:40 PM   #3
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Yeah that's normal. The HVAC is computer controlled. What you hear is one of the regulators returning to its default position.

In fact you'll hear it doing it's business even when then jeep is off.
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Old 02-05-2013, 03:58 PM   #4
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Yeah that's normal. The HVAC is computer controlled. What you hear is one of the regulators returning to its default position.

In fact you'll hear it doing it's business even when then jeep is off.
Thanks for info much appreciated!
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Old 02-05-2013, 08:38 PM   #5
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Originally Posted by Blastek View Post
Yeah that's normal. The HVAC is computer controlled. What you hear is one of the regulators returning to its default position.

In fact you'll hear it doing it's business even when then jeep is off.
Took a while for me to get used to this. At first I thought my Jeep was possessed.
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Old 02-07-2013, 04:16 AM   #6
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If you want to see it in action, park your Jeep and with the engine running, squeeze the sides of the glove compartment door until you can remove the door. Shine a light back at the cage - that's the air intake for the HVAC. When you have it set to fresh air, with it running, the cage door is closed to the inside, now turn the recirculate mode on and watch what happens. The door will lift and block outside air from entering, now it's pulling in air from behind the glove compartment.

Go back to fresh air again and wait for it to reset to the normal position and then turn off the engine. Now it will re-adjust again. It settles into a position where it's in between the fresh and recirculate settings. If you sit in your Jeep for a bit, you will also notice it will sometimes open, close, and re-settle again.

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