I need help with a noise
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Joined: Aug 2011
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From: Kodiak
I need help with a noise
So I am a new diesel owner, well a year but I think that is still new. I have put about 3K on it since I have owned it. Once in a while when I start the truck I hear a "thud" sound, almost like a door shutting. It happens about two to three seconds after start up. The "thud" is very inconsistent and at times will vary in intensity. Also it only happens once. So if any one has had this happen or has a clue on what this may be please give me a heads up. Thanks
Hotshot
Joined: Feb 2003
Posts: 11,537
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From: Long Beach, Ms.
It may just be a ventilation system door moving.
A check valve may be failing allowing the vacuum system to leak down when the truck is not running.
This may be so slow a leak that a long period needs to pass before the door has moved far enough to make a noise.
After starting the vacuum takes a moment to build up in the lines and move things to where the ***** tell them they should be.
A check valve may be failing allowing the vacuum system to leak down when the truck is not running.
This may be so slow a leak that a long period needs to pass before the door has moved far enough to make a noise.
After starting the vacuum takes a moment to build up in the lines and move things to where the ***** tell them they should be.
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New User
Joined: Aug 2011
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From: Kodiak
Started with defrost selected, no thump. I'll let it sit this week and try one more time but more than likely start it in the off position in the future to see if the thump returns.
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Posting Guru
Joined: Jul 2008
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From: Morehead, Ky.
If you have a vacuum leak as Shorebird mentioned, the AC will default to defrost.
Someone correct me if I am wrong.
Someone correct me if I am wrong.
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Cargo Master
Joined: Oct 2007
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From: BoCoMo
So I am a new diesel owner, well a year but I think that is still new. I have put about 3K on it since I have owned it. Once in a while when I start the truck I hear a "thud" sound, almost like a door shutting. It happens about two to three seconds after start up. The "thud" is very inconsistent and at times will vary in intensity. Also it only happens once. So if any one has had this happen or has a clue on what this may be please give me a heads up. Thanks
There is nothing wrong with your truck. It is working as it should when you have your 'temp' on a certain setting.
Posting Guru
Joined: Dec 2006
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From: Windsor, Colorado
Yep it is fine. My 02 did that from the day I bought it new.
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