This sticky is for links to the most asked about questions, info, specs and general knowledge regarding general Technical Items not covered by a specific section.
If you see a thread that should be considered to be added here, click on the <Report> button with a note indicating that it should be added.
Miscellaneous
02-06 GMT360/370 Parts List
Carb cleaner or throttle body cleaner?
Throttle Body Cleaner ?!?
PCM Security Relearn
Fuel tank filler neck repair kit
"How To" Remove, Repair & Replace Broken Fuel Tank Filler Neck, R&R Delphi Fuel Pump & Quick Disconnects
Trailblazer fuel pump R&R...without dropping the tank
Counterfeit ACDelco Plugs
Filling with fuel always make the pump click off
No Start, Multiple U1000 codes, Class 2 Serial Communication Problem
How to repair sunroof
Module calibration info at ACDelco Tis2Web to see if there is an update available
Video: How to repair fuel tank inlet
Sunroof drain holes
Unknown driver
LWB Envoy Top of tank Vapor canister replacement
How to diagnose U codes (loss of communication) Video
HVAC
a/c control issues 2005 TB (Front actuators/diagram)
2003 Trailblazer HVAC Schematic(EXT/XL Rear)
2004 trailblazer ext LS fresh air actuator problems. (Dash removal)
AC Compressor Clutch Adjustment / Replacement parts advice
A/C Compressor Autopsy. (YouTube Video)
A/C Clutch Replacement
A/C stopped working, excessive pressure on low pressure side (Bad/Weak Clutch)
USED Actuator calibration (Internal gear positioning)
Passenger side actuator replacement
How to "rebuild" HVAC actuators
Compressor Clutch Shim Removal (with pics)
How To: Replace the Heater Core (Without Removing the Whole HVAC Box)
Automatic HVAC blower module fix (MOSFET replacement)
How to recalibrate the HVAC actuators
A/C Clutch Kit from AliExpress (how to replace)
TSB: Poor rear heater performance in EXT/XL
Electrical
How to: Add a Temp / Compass rear view mirror
How to: Add Compass and Temp rear View Mirror
Rear Wiper Not Working ?
DRL Eliminator
Quad Beam Headlights W/ or W/O Fog lights (Diode Edition)
How To: Quad Beams and Automatic Fogs (Wiring mods)
Which Halogen Headlights Should You REALLY Buy? (Halogen vs. HID vs. LED)
Electrical Ground locations
No Crank, Like Attempting To Start In Drive
Headlights went out while driving...help
DRL Killer / Quad Hi-Beams - Idiot's Guide
Blown megafuse after jumpstart or boost
How To: Replace "Shark Fin" roof antenna, 2006 Envoy [pics]
Red Wire (The disconnected ring connector near battery/underhood fuse box)
(tip) Brake lights inop, blown fuse
Rebuild your ignition switch
Battery light stays on but very dim
Battery light stays on, charging system checks out
Regulated Voltage Control (SARVC)
How to Use a Parasitic Draw Test Switch & Cable
Quad Brake Lights
Brake and tail light(s) circuit check
Liftgate wiring broken wires
How to troubleshoot the rear window wiper in a lift gate module system
How to: Repair broken screw in taillight housing
If you see a thread that should be considered to be added here, click on the <Report> button with a note indicating that it should be added.
Miscellaneous
02-06 GMT360/370 Parts List
Carb cleaner or throttle body cleaner?
Throttle Body Cleaner ?!?
PCM Security Relearn
Fuel tank filler neck repair kit
"How To" Remove, Repair & Replace Broken Fuel Tank Filler Neck, R&R Delphi Fuel Pump & Quick Disconnects
Trailblazer fuel pump R&R...without dropping the tank
Counterfeit ACDelco Plugs
Filling with fuel always make the pump click off
No Start, Multiple U1000 codes, Class 2 Serial Communication Problem
How to repair sunroof
Module calibration info at ACDelco Tis2Web to see if there is an update available
Video: How to repair fuel tank inlet
Sunroof drain holes
Unknown driver
LWB Envoy Top of tank Vapor canister replacement
How to diagnose U codes (loss of communication) Video
HVAC
a/c control issues 2005 TB (Front actuators/diagram)
2003 Trailblazer HVAC Schematic(EXT/XL Rear)
2004 trailblazer ext LS fresh air actuator problems. (Dash removal)
AC Compressor Clutch Adjustment / Replacement parts advice
A/C Compressor Autopsy. (YouTube Video)
A/C Clutch Replacement
A/C stopped working, excessive pressure on low pressure side (Bad/Weak Clutch)
USED Actuator calibration (Internal gear positioning)
Passenger side actuator replacement
How to "rebuild" HVAC actuators
Compressor Clutch Shim Removal (with pics)
How To: Replace the Heater Core (Without Removing the Whole HVAC Box)
Automatic HVAC blower module fix (MOSFET replacement)
How to recalibrate the HVAC actuators
A/C Clutch Kit from AliExpress (how to replace)
TSB: Poor rear heater performance in EXT/XL
Electrical
How to: Add a Temp / Compass rear view mirror
How to: Add Compass and Temp rear View Mirror
Rear Wiper Not Working ?
DRL Eliminator
Quad Beam Headlights W/ or W/O Fog lights (Diode Edition)
How To: Quad Beams and Automatic Fogs (Wiring mods)
Which Halogen Headlights Should You REALLY Buy? (Halogen vs. HID vs. LED)
Electrical Ground locations
No Crank, Like Attempting To Start In Drive
Headlights went out while driving...help
DRL Killer / Quad Hi-Beams - Idiot's Guide
Blown megafuse after jumpstart or boost
How To: Replace "Shark Fin" roof antenna, 2006 Envoy [pics]
Red Wire (The disconnected ring connector near battery/underhood fuse box)
(tip) Brake lights inop, blown fuse
Rebuild your ignition switch
Battery light stays on but very dim
Battery light stays on, charging system checks out
Regulated Voltage Control (SARVC)
How to Use a Parasitic Draw Test Switch & Cable
Quad Brake Lights
Brake and tail light(s) circuit check
Liftgate wiring broken wires
How to troubleshoot the rear window wiper in a lift gate module system
How to: Repair broken screw in taillight housing
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