2005 GMC Sierra the fan

2005 GMC SIERRA
291,556 MILES • 4 CYL • FWD • AUTOMATIC
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CATHY WORRELL
  • MEMBER
  • 1 POST
i have an question the fan on my truck comes on by it self when the truck is turn off and key is not in switch i had to un plug the battery cable to keep it from coming on in the middlle of the night and killing my battery how do i fix it why is it doing this please help cathy
Feb 16, 2010 at 9:35 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Check and test the fan relay and coolant temperature sensor
Feb 16, 2010 at 9:40 PM
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