![background image](http://html.mh-extra.com/html/chevrolet/trailblazer/trailblazer_service-manual_2597679623.webp)
CAUTION
By law only certified HVAC technicians can legally perform operations that involve
installation and/or the removal/recovery of vehicle refrigerant. This is true of any and all
operations that involve the potential for releasing of refrigerant into the atmosphere.
General Troubleshooting
Leak Testing
WARNING
Never leak test the A/C system with compressed air. A mixture of air and R-134A can
become combustible at high pressure. This mixture may result in fire or explosion causing
injury and/or property damage.
WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the
beginning of this section.
A/C system service requires the use of a manifold gauge set with vacuum pump or a
refrigerant recovery/recycling station. The best way to determine if the system has a leak
is to evacuate the refrigerant from the vehicle into a refrigerant recovery/recycling station.
Once the refrigerant has been recovered the refrigerant recovery/recycling station will pull
a vacuum on the system. Isolate the A/C system by closing the valves when the vacuum
reaches -26 in. Hg (-88 kPa). A leak free system should be able to hold vacuum for at least
15 minutes or more. If you can not reach the vacuum specified, air is leaking into the
system, and the source must be located and repaired.
Leaks will most likely occur at hose fittings and connections. A leak can also occur at the
compressor shaft seal at the front of the compressor. The A/C system contains refrigerant
oil mixed with refrigerant. Look for oily deposits at hose and pipe connections that indicate
a leak. Fluorescent refrigerant system dye can be added to the refrigerant system to assist
in refrigerant system leak diagnosis using an ultraviolet black-light.
Use an electronic refrigerant leak detector to validate leaks.
NOTE:
Fluorescent refrigerant system dye is added to the refrigerant system at the factory
on some vehicles. It is not necessary to add additional dye to the refrigerant system before
diagnosing leaks, even if a significant amount of refrigerant has been removed from the
system.
Summary of Contents for TrailBlazer
Page 1: ......
Page 26: ...Fig 3 Typical body and undervehicle maintenance locations Refer to chart for descriptions ...
Page 29: ......
Page 30: ......
Page 31: ......
Page 175: ...Spring free length check Valve spring squareness check ...
Page 192: ...Front of piston mark ...
Page 361: ...5 3L Engine Except Saab Underhood Fuse Block 2003 2005 Early Production ...
Page 469: ...Removing the outer band from the CV boot Removing the inner band from the CV boot ...
Page 470: ...Removing the CV boot from the joint housing Clean the CV joint housing prior to removing boot ...
Page 471: ...Removing the CV joint housing assembly Removing the CV joint ...
Page 472: ...Inspecting the CV joint housing Removing the CV joint outer snap ring ...
Page 473: ...Checking the CV joint snap ring for wear CV joint snap ring typical ...
Page 474: ...Removing the CV joint assembly Removing the CV joint inner snap ring ...
Page 475: ...Installing the CV joint assembly typical ...
Page 553: ...9 Torque the lug nuts to specification 10 Lower the vehicle ...
Page 556: ...Toe in Frame Misalignment Frame misalignment ...
Page 588: ...Bleeding caliper ...
Page 624: ...Manifold gauge set components Refrigerant recovery recycling station ...
Page 676: ...A C Specifications ...
Page 677: ......