I have just noticed that when I shut off my engine with the AC on that I hear a sort sound like PSSST from the right front of the truck. I am thinking it might be a belt making the noise since the AC compressor is engaged. When the AC is off I do not get any noise.

Anyone else hear this?

Thanks,

Tom

 

normal with the pressure in the system. I got tired of the sound so I bought a bigger turbo now when I shut it off I only hear the turbo wheel...

 

From the way it sounds to me, what your describing is " Cummins Squeak"
Iv got it on my 05.
As previous poster stated, its normal.

 

buddy replaced his alt. pulley to the update rev. and it stopped.
It`s got some kind of anti-rollback.

 

Normal! I like it! I think it's pretty SWEET sounding!

 

i heard it was from the engine coming to a quick stop and the acessories still having momentum. that causes the belt to slip on the some of the pulley's. just what I have heard

 

is it hissing or squeek? squeek is the belt sliiping due to the engine stopping very fast(compression makes it stop quick)
hissing is the remaining refrigerant going through the orifice until all parts of the a/c system equalize after shutdown

neither one is cause to worry.

 

Thanks everyone for the replies. Now I know that it is a normal sound.

Tom

 

Or...


You treated your truck badly and it's now PSSSST off.

 

What he said: equalization of pressure in your ac system. Normal

 

like someone stated.. there is a fix for that noise.. my truck is an 06 and does that.. i thought something was wrong but no.. all is normal
i might have them do the tsb for that pulley..

 

I've been wondering about the squeek too and I'm glad to know its nothing to worry about.