GM-GMC Full Size Truck HVAC Recalibration Procedures

[mrrsm]

For the Owners of GMT-800 Series Full-Size Trucks and SUVs troubled with HVAC Controls Recalibration Issues, THESE Videos will Help:

Check Out Eric "O"s more sophisticated use of a Tiny "uScope" Oscilloscope and note that he is addressing the particular points of attention on the Wiring Diagram...while holding the Two Needle Back Probes he will use to send the signals to his Lil' "O" Scope:

One Last Suggestion... The Tools for the HVAC Blend Door Actuator R&Rs may get overlooked until you get down under the Dash...and realize that NONE of your Small 1/4" Drive Sockets will FIT. Damn... BUT... Check Out Amazon for THESE Two Variations on a Theme for 5.5 mm Sockets in BOTH the Shallow and Deep Socket Versions. You will NOT Regret having these dropped inside of a Tall Medicine Bottle marked with "5.5mm":

 

[mrrsm]

Once you get hold of the various Craftsman 5.5mm 6 Point Deep & Shallow Sockets... Clip Off the Tops of the Red Plastic Craftsman Labels-Carriers-Hangers ... and then drop the Tools and Labels into a Right-Sized Medicine Bottle and place it inside of your 1/4" Tool Bag Kit. You will NEVER regret making this effort to isolate these Sockets when performing the Blend Door Actuator R&Rs!