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2001 Chevy Blazer engine noise

Tiny
CHEVYGUYHERE
  • MEMBER
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Sometimes when the weather is hot and the air conditioner is on the engine makes a lot of noise (roaring - like no muffler) and seems to lack power. Has anyone seen this?
Sunday, August 23rd, 2009 AT 7:35 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,705 POSTS
Is the sound like a roaring or whirling sound?
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Wednesday, September 2nd, 2009 AT 7:57 AM
Tiny
CHEVYGUYHERE
  • MEMBER
  • 2 POSTS
Definitely roaring
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Wednesday, September 2nd, 2009 AT 11:18 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,705 POSTS
Based on your description, I would say the fan clutch is (working correctly) is locking in because of the heat. They are designed to spin the fan at different speeds based on temp. If it's really hot, they will lock and the fan will spin as fast as the waterpump is spinning. As a result, they make a roaring sound. Once they cool down or the outside temps are cooler, there is no need to lock in fully and they don't spin as fast thus not making the noise.
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Wednesday, September 2nd, 2009 AT 11:26 AM

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