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Hi just wondering about this noise. im not too concerned it`s always done it just wondering what it is. when i start my 04 on cold mornings right after I start it it will make a kinda grr clunk sound then the turbo will start it`s normal whistle right after that. never hear it in the summer & it`s not near as bad when i plug it in. oh and this turbo #3 was only put on 3 weeks ago & it still does it.
Perhaps what you are hearing is the vacuum pump running and then one of the AC door actuators functioning as the vacuum comes up. I hear that on my 04.
My 04 does the same thing and it does not matter whether the AC is on or off. The temp here is usually between 40 and 50 in the mornings year round. I asked around and the answer was that it could be the waste gate.
My 04 does the same thing and it does not matter whether the AC is on or off. The temp here is usually between 40 and 50 in the mornings year round. I asked around and the answer was that it could be the waste gate.
There is no "Waste Gate" on the 6.0 it uses a VGT turbo. The AC/Heat blower door will cycle shortly after start-up with or without the AC/Heat on.