Air will not blow from the vents that face out or that defrost in the front part of my 2004 GMC Envoy, although the rear works normally. I can feel the heat getting hot or A/C getting cold when I put my hands near one of the vents, it is just not being blown out. Sometimes, opening and shutting my drivers side door or adjusting the driver's side seat will cause it to kick back on and start blowing for a while before stopping again.I'm not sure where to begin to diagnose the underlying cause of this issue.
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