truck idle

2003 CHEVROLET TRAILBLAZER
140,000 MILES • 6 CYL • 4WD • AUTOMATIC
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AARONWOLFF
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  • 2 POSTS
My truck idles up and down when i turn on the defrost
Nov 13, 2010 at 10:20 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
It automatically idles up when the A/C compressor engages. With the defroster on, the A/C compressor would be cycling on and off causing that so it's normal.
Nov 13, 2010 at 10:40 PM
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AARONWOLFF
  • MEMBER
  • 2 POSTS
The truck is stalling,the idle goes up and down and then stalls.Not normal.
Nov 13, 2010 at 10:42 PM
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