whistling sound while accelerating
Hi guys- I have a 2000 WJ V8 4.7 with 135k miles on it and recently there has been a whistling noise while accelerating. Typically, a few minutes after I start the engine and head out onto the highway, I will accelerate to 3500 or so RPMs to get up to the 65mph speed limit. While doing so, there is a whistling sound coming from the engine area as the Jeep climbs/accelerates to a higher mph. This only happens after Ive started the Jeep and for the first 5-10 minutes or so while I am driving and need to climb to a higher mph. I am not punching the accelerator or abusing it, however when I need to accelerate and have the RPMs at a higher rate, there is a whistling sound that gets louder as the RPMS climb.
Any suggestions as to what this may be?