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Old 08-08-2016, 07:25 AM   #1
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Dashboard Knock

My dads 2010 2500 Hemi Crew Cab has a bad knock in the dashboard when he turns it on.
It freaked my wife out when we took it for a spin... It sounds like something is trying to get out HAHA.

So its from the center to passenger side and it happens on start up and then periodically after that. My first thoughts are its an issue with the AC/Heat director or something. I tried changing things to reproduce the noise but didn't get anything consistent...

Anyone had anything like this before?

Thanks

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Old 08-08-2016, 08:28 AM   #2
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Yes it very likely an AC door. Does it have dual climate or single?

You have the recirculation door
Driver temp
Pass temp (if dual)
Then two other mode doors.

Try starting the truck and putting it on defrost and see if it goes away. Also try setting to hot on both or one and then try setting to floor. Noise behind dash is 99% door issue all the time only thing to move in there. Issue is finding the door making the noise.
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Old 08-08-2016, 08:46 AM   #3
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Mine does this from time to time, makes like a pop/ knock sound I always think it's my dash just cracking more..
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Old 08-08-2016, 09:24 AM   #4
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What causes it?

Loose door? Vacuum leak? electrical short?

How do those operate?

Thanks Guys
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Old 08-08-2016, 09:24 AM   #5
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Maybe there is something trying to get out!
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Old 08-08-2016, 10:33 AM   #6
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Quote:
Originally Posted by kcd1369 View Post
Maybe there is something trying to get out!
OR somebody
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Old 08-08-2016, 11:20 AM   #7
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Originally Posted by LowerThatRam View Post
What causes it?

Loose door? Vacuum leak? electrical short?

How do those operate?

Thanks Guys
---------------------------------------
Unfortunately I think what causes it is poor quality materials and poor engineering from the manufacturer...if you want the truth .
As Keith has diagnosed it probably is the door and there are better quality aftermarket parts and solutions.

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Old 08-08-2016, 03:04 PM   #8
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The doors are electric. They use a small gear/large gear combo for torque and slow speed. What happens is the big gear gets stripped out in a small section and you hear that click/pop noise most times at a very rapid speed for say 15-30 secs and then it will stop because the module realizes it has no control of the door. Sometimes it will sample the door meaning try to move it again after a bit and you will hear same noise. Best bet is to figure out which door it is and get a dealer door. Some actuators can be done dash in some dash out. If you can figure out which one it is I can possibly walk you thru changing it out!
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Old 08-08-2016, 06:33 PM   #9
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Great info thanks, I will relay this to Dad...
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