C 1500 Truck 2WD V8-454 7.4L (1990)
Expansion Block/Orifice Tube: Technical Service Bulletins
A/C Orifice Tube - Revised and New Location
Number:
90-349-1B
Section:
1B
Date:
October 1990
Corp. Bulletin No.: 061204
Subject:
NEW LOCATION OF THE AIR CONDITIONING ORIFICE TUBE
Model and Year:
1990 C/K TRUCKS
TO:
ALL CHEVROLET DEALERS
C/K trucks built after October 31, 1989, have the orifice tube located in the condenser outlet pipe. The orifice tube, part # 3096068, is unique for this
application and can be easily identified by the black colored inlet end.
Parts are currently available through GMSPO.
Special caution must be used in servicing and replacing the orifice tube. This new orifice tube is black and white, and the black end must be inserted into
the condenser outlet. Do not use the old all white orifice tube for trucks built after the following VIN breakpoints listed below. For trucks built before the
VIN breakpoints listed use P/N 3033879.
VIN Breakpoints:
Fort Wayne - LZ140485
Pontiac East - LE132779
Oshawa - L1126075
Failure to use the correct orifice tube or follow proper installation of the new tube may result in restriction of the liquid line and subsequent replacement
of the liquid line.
