GMC not XL 1500 or 2500.
not told what is wrong, modes failed?
or if just blower dead. what fails how, not told, symptoms not told.
even blower motor can fail. or even be intermittent
not told source of controllers. (OEM dealer is answer)
read the TSB on this car for updates??????
OEM parts can be newer versions, we never fail to read all TSB first.
at failures did you use
a scan tool for HVAC errors first?
TSB , Iook at them and there are like 10 TSB on topic.
seen here
https://eautorepair.net/Marketing/Default.asp'
now tsb 06-01-39-002C, blower, in the list #4
even blower stuck on key off or dead key on
cause
These conditions may be caused by a blower motor control module failure. This failure may
occur when the vehicle is operated in ambient temperature conditions of -23°C (-10°F) or
below.
Replace the blower motor control module if the vehicle experienced a blower motor
control module failure in extremely cold ambient temperature conditions.
Technicians are to replace the blower motor control module, also called the Linear Power
Module (LPM), with the P/N listed below. Refer to either the Blower Motor Control Processor
Replacement or Blower Motor Processor Replacement-Auxiliary procedures in SI. After
replacement of the blower motor control module, the customer may notice a slightly higher
than expected blower motor speed at any of the blower speed settings
and more this is just one hit, there, on blower there are 10 there.
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