I recently bought a 2001 PSD and every once in a while right after startup it clunks. It only does it once while in park. What causes it? Is this something to worry about?

 

Could be the vent door opening or closing

Les

 

glad to know I'm not alone! my 01 PSD 4x4 f-250 makes the same thump sound. (2 or 3 times a week) It sounds like a door closing? So far it has only done it when I'm alone, and just as I let up on the clutch. ????????

 

Welcome to club clunk. My 01 PSD 4x2 F350 does this and as it turns out it is the vent door, at least on mine. Annoying but not critical.

 

ford has a tsb out on that clunk, it describes it as: "a clicking sound or clunk about 20-40 seconds after starting" - it is caused by some little pin or something in the electronic shift-on-the-fly 4x4, it's not supposed to occur on floor mounted shifting 4x4's or 2wd's, so if you don't have the dash mounted shift-on-the-fly system, then i dont' know what to tell ya

 

 

Been lots of chat about this noise. Both my '89 F250 460 gasser and my '02 F350 SRW Diesel make this noise. It appears to be something in the vent system when started with the AC on (including defrost). Most likely a vent door actuator or some such item activating. Mine won't do it if started with vent off or AC not on.

 

Any idea what the TSB # is for this condition?

 

I have a 99 powerstroke, and I hear the same noise. So I read my owners manual, it says the system is checking the anti-lock brakes, when you hear this thump.

 

I'm new to this site, but I came here looking for information on something that I was beginning to think was my Imagination... A clunk shortly after starting on my 2002 PSD F250. Lo and behold, here it is...I'm glad to hear I'm not imagining things.

Thanks all, Great to be here !

 

[updated:LAST EDITED ON 22-Dec-01 AT 10:15 PM (EST)]My 2001 F250 PSD 4X4 Supercrew has the same clunk 20 seconds or so after starting. I it has done it since new,:P
I do have shift on the fly.

 

My '01 did that after start-up and I don't have ESOF. Turn your heater control to off before you start the truck and it will probably stop. Like some others said,it's a vent door or something along those lines.