Kenworth T680 Blend Door Actuator (Broken defroster)
If the defroster on a Kenworth t680 or Peterbilt 579 has stopped working this is the likely culprit.. blend door actuator shorting and snapping the blend door. Unfortunately, the dashboard has to be removed to complete this repair, and while it is not complicated it is time consuming. T20 Torx and Phillips head screwdriver (and a ton of patience) are all that is required.

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