But the fan fuse is blown

 

Should it do it all the time if it was that it only does it at running temp and at idle

 

Can it possible for it to be the trans or the egr value

 

Check the PCV valve for a missing O-ring. They are often missing when you buy a replacement.
Air could be rushing past the PCV causing the whistle.
Try taking the PCV valve out and test run without it to see if the noise goes away.

 

When I bought the car it didn't have one in it and it still done it

 

Just saw this thread this afternoon. A shop thinks it's the harmonic balancer.
There's a rubber bushing between the two piece pulley. Possibly slipping?

Thread: https://montecarloforum.com/forum/mo...e-54423/page2/

 

O I forgot to mention that I put one in

 

Thanks I will look at that tomorrow

 

O I forgot I took the belt off and it still does it

 

Any chance you can make a video with audio and upload it on YouTube, then copy the link and paste it in a post here?

Does it sound like this?

Commentary on this video doesn't say what the cause was (hate that), but one guy said he had the same noise caused by a vacuum leak from the upper intake manifold gasket near the MAP sensor. I would also check where the throttle body connects to the UIM. You could try a rudimentary smoke test by moving a smokey cigar around those gaskets to see if smoke pulls in.

Another possibility is a dirty IAC valve with a stuck pintle, but that usually effects the idle. Might be worth checking out though.

If you have access to a scan tool capable of reading fuel trim values check them. Ideal readings are 0% Short term and 0% Long term. Anything more than about + or - 10% would be a strong indicator of a vacuum leak.