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Truck idle

Tiny
AARONWOLFF
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
My truck idles up and down when I turn on the defrost
Saturday, November 13th, 2010 AT 10:20 PM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
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.
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Saturday, November 13th, 2010 AT 10:40 PM
Tiny
AARONWOLFF
  • MEMBER
  • 2 POSTS
The truck is stalling, the idle goes up and down and then stalls. Not normal.
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Saturday, November 13th, 2010 AT 10:42 PM

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