C 30 1 Ton Pickup 2WD V8-454 7.4L VIN W 4-bbl (1983)
1.
Remove lower door trim panel, exposing louvers at the bottom of the door.
2.
Unscrew the two screws retaining the air valve assembly behind door louvers. Let the valve assembly drop to the bottom of the door.
3.
Use a die grinder with a cut-off wheel to cut the louvers out of the door. Remove any material falling inside the door.
4.
Smooth any rough edges with a file.
5.
Paint exposed metal edges to prevent corrosion.
6.
Reinstall air valve assembly.
NOTE:
It is imperative that the air valve assembly is not damaged and that it is reinstalled correctly. Failure to do so could result in cold air
and/or exhaust fume entry into the cab.
7.
Reinstall lower door trim panel.
The time required to perform the above service procedure on two doors is 0.4 hours.
