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Jan 1, 2009 | 04:14 AM

Rider15

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From: El Cerro Mission - LL

Thump?

I have 2004 F-250 SD XLT V-10 4x4. It makes a Thump under the hood someplace. Does not happen all the time, but enough to make me wonder what it is and how to fix it.

Happens within a minute or so of start up.

Jan 1, 2009 | 07:22 AM

hanklin

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From: Here in No. Calif

missing a kitty?

sorry

Hanklin

Jan 1, 2009 | 07:34 AM

Rider15

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From: El Cerro Mission - LL

Luckily....NO

Jan 1, 2009 | 08:55 AM

aldridgec

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From: Wake Forest, NC

Common, the blend doors moving sometimes make a thump. happens right after startup on most trucks.

Jan 1, 2009 | 09:15 AM

redford

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From: Stephensville WI

I've heard it also. I've always assumed it was the blend door, which (when the engine is cold) draws intake air around the exhaust manifold to aid in cold weather operations and warmup.

Jan 1, 2009 | 09:33 AM

ken kenmnedy

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From: muskegon mi.

IS that what that is it dosnt happen all the time but when it did it was spooking me out

Jan 1, 2009 | 12:36 PM

FireMe

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From: Northfield, MI

Quote:

Originally Posted by redford

I've heard it also. I've always assumed it was the blend door, which (when the engine is cold) draws intake air around the exhaust manifold to aid in cold weather operations and warmup.

Actually, it's the door in the HVAC housing. It is spring loaded and bleeds down to an open position until you start the vehicle. Once vacuum builds, it slams shut. You can eliminate this by putting the HVAC control in the "off" position when you shut down.

Has nothing to do with anything under the hood.(Haven't had heat risers on the manifolds in a decade or so.)

Jay

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Jan 1, 2009 | 02:37 PM

Fordfanatic4life

Postmaster

Joined: Oct 2008

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From: Richmond BC

yeah mine does it and its def in the HVAC system.. u can hear it thump on the passenger side bottom of the dash.

it can be quite loud actualy..

Jan 1, 2009 | 04:05 PM

#10

Green Ford

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Joined: Dec 2007

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From: Raleigh, NC

Quote:

Originally Posted by hanklin

missing a kitty?

sorry

Hanklin

Thats just wrong.....

I'll never forget the day my father inlaw started his Bronco and OMG the neighbors cat came flying out minus lots of hair!

Jan 2, 2009 | 12:11 AM

#11

Rider15

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5th Wheeling

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From: El Cerro Mission - LL

Thank You

I am a much happier man now that I know it is nothing mechanicalor feline. Have a happy New Year.

Jan 2, 2009 | 02:36 AM

#12

Zip

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From: Princeton, BC

Mechanicalor feline. Is this a new technical term.

I'm sorry sir but your truck has a thumping mechanicalor feline.....................and it's not covered under warranty.

Jan 2, 2009 | 07:47 AM

#13

SGnAZ

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From: Az

Quote:

Originally Posted by Zip

Mechanicalor feline. Is this a new technical term.

I'm sorry sir but your truck has a thumping mechanicalor feline.....................and it's not covered under warranty.

It's too early to laugh this hard

Jan 2, 2009 | 06:06 PM

#14

Rider15

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5th Wheeling

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From: El Cerro Mission - LL

Now you all need to realize, and ASE and Denver Automotive keep mistakenly cross referenceing the Electricalorcanine with the Mechanicalorfeline. These are 2 entirely different critters.