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GM Grand Master Technician 2007. 14 year experience.
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The information that you need to gather should include:


  • The make, model, and year of your vehicle
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  • A detailed description of the symptoms, including sounds, smells, leaks, or other visible signs of damage
  • The situation when the symptoms occur
  • How often or consistently they occur
  • Any recent related repairs

With this information, an automotive expert should be able to identify any GMC problems you have, and help you decide how to address them.