2003 Pontiac Aztek What can it be?

2003 PONTIAC AZTEK
120,345 MILES • 6 CYL • FWD • AUTOMATIC
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DHUDLUN
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When I start my engine it hisses and as I go thru out the day it does not stop. I spraye WD 40 on it, but it will only stop it temporarily. What can it be. I checked the belt and it is not frayed or cracked as far as I can see. It only does the noise loud when I accelerate. What do you think it could be.
Oct 27, 2009 at 6:54 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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