Air Leak on M923A2

[RedOctober]

Today I turned my truck off and heard an audible hissing noise in the area of the drivers side wheel well. It is definitely an air leak and it seems to only be draining air from the secondary tanks as the secondary gauge is the only one losing air pressure. Do you guys have any idea what air line it could be. There is a maze of air lines on these trucks and any help is appreciated.

 

[dilligaf13]

That's the area the air compressor is located. Get a spray bottle of soapy water and begin spraying the lines, you'll see the line begin to bubble quickly if you can hear it leaking. Happy hunting....

 

[Capehenery]

Check your Fan Clutch Thermal Actuator its on the metal radiator hose at the top of the engine just behind the radiator. It activates the fan clutch and has a small hole at the back of it where the air leaks. I have read where others have had success cleaning and reinstalling them. I have not tried yet but will be doing this soon.

 

[Suprman]

The front glad hands are notorious leakers also