TSB Document:

• Sorry, the NHTSA has not posted this TSB document yet.

You can still get the detailed info from GMC for this TSB. Call your local GMC dealer's service department & ask for a copy of TSB# 3556A.

Affected Component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:FAN/MOTOR

Summary

REAR BLOWER TURNS ON BY ITSELF/DEFAULTS TO HIGH BLOWER SPEED AND/OR DEFAULTS TO FULL COLD. *TT

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