Wierd clunk

[dbllung]

I have a 2008 F250 KR and i have started noticing a wierd clunk from the passenger side floorboard area. It occurs about every 30 seconds when I am idling at a stop or at slow speeds. Otherwise, the truck runs strong.

Could this be the 'Blend door" problem?

Really frustrating.

[wilsonw2]

Originally Posted by dbllung

I have a 2008 F250 KR and i have started noticing a wierd clunk from the passenger side floorboard area. It occurs about every 30 seconds when I am idling at a stop or at slow speeds. Otherwise, the truck runs strong.

Could this be the 'Blend door" problem?

Really frustrating.

Blend or door is more of a typewriter noise. If u could be more explicit with your "clunk" noise I might be able to help u out more.


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[Ryan Rønning]

Mine does the exact same thing. To me it sounds like some one kicking the bottom of the can with a shoe on. I thought it was the blend door also.

[sckingranch]

It has something to do with the A/C compressor. Turn your a/c off and it will stop. I have the same thing going on with mine. Has been doing it for a while so I wouldn't worry about it.

[Eric@PTP]

Its just the climate control blend door, nothing wrong its just noisy.

[ryandamo]

mine does this also was actually gonna post on it, there is no fix for this? it appears to do it only in defrost

[mthompson]

I noticed the same noise the past few days. It's been cooler out so I've been idling more in the morning, and also idling after I stop until around 300°F egt. I know the ac is off and defrost is definitely on. The sound is not a typewriter noise, it is a clunk that sounds sort of mechanical.... Kinda like train cars coupling together (obviously not that loud though). I can also feels the clunk in my feet, but it definitely is coming from the passenger side floor area.

I will idle without defrost and see what happens.

MT

[srjd]

Nothing to worry about they all do it on defrost. My 6.0 was even louder when it did it

[mthompson]

Originally Posted by srjd

Nothing to worry about they all do it on defrost. My 6.0 was even louder when it did it

I concur, had the defrost and AC off for the past few days and no clunks were heard. It was dewy/foggy here this morning, so the defrost got turned one.....clunks returned.

MT

[Motorboy8769]

Mine don't really clunk but the truck sounds like it misses and then rocks a little bit but only on defrost


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