Strange Noise
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Mountain Pass
Joined: May 2004
Posts: 173
Likes: 2
From: WI
Strange Noise
Whenever I start my truck after it has been sitting overnight or at the end of the workday, I hear a thud under the passenger side floor and firewall area. Seems to happen more so during cooler or cold weather. I have inspected the underneath of the truck and under the hood and found no evidence of anything wrong. Anyone else ever come across this noise?
2003 Crew Cab V10 6-Speed 4x4
2003 Crew Cab V10 6-Speed 4x4
Senior User
Joined: May 2010
Posts: 471
Likes: 1
From: Pocatello, Idaho
It might be the vent flaps opening. I believe they are opened by vacuum. I might be wrong so hopefully someone else will respond.
Last edited by IslandBlueV10; Nov 4, 2011 at 07:53 PM. Reason: Changing some info
Fleet Mechanic
Joined: Sep 2007
Posts: 1,256
Likes: 6
From: Garden Valley, Idaho
Before you shut it off for the night, turn off the heater/AC for a minute. See if it does the same thing after you start in the morning, then turn on the heater. I'll bet it's the vacuum too.
Pap
Pap
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Mountain Pass
Joined: May 2004
Posts: 173
Likes: 2
From: WI
I will try what your suggesting but I should've included that the noise is a loud thud. Kinda sounds like the floor is being struck with a hammer from the underside of the cab. Sometimes I can feel it as well.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
The blend door slamming shut makes a thud like that, almost positive thats what your hearing. I always turn off the vent, A/C, defrost and etc before shutting the truck off.(force of habit) Try to remember to do that and see if the thud goes away.
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