Hi:
If it only happens with the AC on at 5K RPM's, I'm going to say it has something to do the the AC compressor. 5K RPM's is somewhat high and if the AC clutch is engaged and has a bearing starting to go bad, that is where the noise may be coming from.
What is red line on the vehicle?
Joe
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Sunday, December 14th, 2008 AT 1:11 PM