1999 GMC C2500 power train module

1999 GMC C2500
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Transmission problem
1999 GMC C2500 V8 Four Wheel Drive Automatic

will not shift gears if air conditioning fan wont blow on high,crazy!
Jun 29, 2010 at 11:15 AM
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MMPRINCE4000
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If you have a check engine light, then have codes read at most autoparts stores for free.
Aug 7, 2010 at 8:56 AM