Noise always at start up and when at idle. Sometimes when going down the road. Sounds like it's coming from front of motor. Maybe fan, ac compressor, water pump? Just can't pin point it.
SOURCE: Loss of power
For the person with the loud engine and poor acceleration, the problem is likely the fan clutch. I think it is about 800$ to be repaired.
SOURCE: Engine light stays on
well very good possiblity it needs a tune up . Take it some where and have them check the codes on it and go from there
SOURCE: high pitch whistling noise in engine compartment of 2005 envoy
There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.
SOURCE: whining noise when the engine running
Yep, That was it. i followed a link to trailvoy.com and found a video with the same noise and links to how to repair. My husband fixed it yesterday and the noise is no more!! Good Luck..
SOURCE: 98 gmc pu blower doesnt always work.
SPEND EXTRA 10 BUCKS AND REPLACE REASTAT ALSO CHEAP INSURANCE GOOD LUCK
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