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2003 Pontiac Bonneville Erratic heater/AC fan operation

Tiny
LOYOUALL
  • MEMBER
  • 2003 PONTIAC BONNEVILLE
Heater problem
2003 Pontiac Bonneville 6 cyl Two Wheel Drive Automatic

Has anyone had experience troubleshooting erratic operation of the heater/AC fan on a 2003 Pontiac Bonneville? The fan works when it wants. It may turn on immediately, many minutes after it has been selected or not at all. It is a problem for all functions (heat/AC and defrost). I suspect a short, but have been unable to find a bad connection. Help on diagnosing the problem is appreciated.
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Sunday, September 6th, 2009 AT 3:05 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect ground point G201 on right front door pilar if okay check and test the HVAC control module and the Blower motor control processor


https://www.2carpros.com/forum/automotive_pictures/12900_ground_point_G201_1.jpg

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Sunday, September 6th, 2009 AT 3:28 PM

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