Bad Engine noise

[caferacer]

I plan to take my '06 V6 in to the dealer this weekend but wondered if anyone else had encountered this problem. Recently, during the hot spell and with my a/c on or off, the engine starts to make a loud blowing sound from around 1500 RPM to around 2500 RPM. At first I thought it was the a/c compressor but it has begun to happen without the a/c on. I recently had the oil changed at the local gas station and checked for loose hoses etc. Any ideas?

Thank you!

Robey in Brooklyn

 

[uh60james]

Might just be the fan, couldn't say without hearing it though.

 

[caferacer]

Well it sounds like the fan but why would it all of a sudden start spooling up like that? Is it just responding to warmer temps? I don't recall it doing that last year or the year before.

Oops. I forgot to mention, a couple of times it seems like my thermostat hasn't opened up and the temp has gone up into the red shortly after start up then all of a sudden drops down to normal. Maybe I need a new thermostat. Do new cars have the same system as my old Jeep?

Clueless!

 

[michael loibl]

Radiator fan on o6 and up is mechanically driven but electronically regulated so it can suddenly increase the fan speed (noise) at a given engine RPM. If you look between the fan and waterpump you will see a wire harness running from driver side and then straight down to the fan. Basically it is a more expensive and complex version of the heat activated fan clutch which was common for decades.

 

[StonedExplorer]

Thanks for the explanation of how the fan works. My 06 V8 does the same thing. I've wondered about it, but haven't heard it enough to worry about it.
-Art

 

[uh60james]

Yeah, its definitely the fan. Mine has been spooling up often at low speeds now that its hot out.

 

[GeorgeH]

Mine has done it 3 or four times as well. Is it normal in high temperatures? Never happened over the winter but each time it happens its in the low 90's.....