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Here is the issue - Gm Trucks and Utilities built
from 2001 - through 2007 have an under designed high blower circuit
that as a result gets very hot at the connection terminal at the
Blower Motor Resistor.
The result is burnished terminals and melted
connectors
 like
one pictured here on the left. Usually when this occurs, it also
damages the Blower Motor Resistor as well by burning the terminal
and melting the plastic housing on the resistor like the one
pictured below. If this is the case, you need to replace both
components.
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