C 1500 Truck 2WD V6-262 4.3L VIN Z (1992)
Expansion Block/Orifice Tube: Technical Service Bulletins
A/C - Orifice Tube Location
GMC NUMBER: 92-1B-116
GROUP: 1B Air Conditioning
DATE: August 1992
CORPORATE NUMBER: 261206
SUBJECT:
ORIFICE TUBE LOCATION
MODELS:
1992 SUBURBAN, YUKON, CREWCAB WITH AIR CONDITIONING C60 OR C69 OPTIONS
There may be some confusion about the orifice tube location on 1992 C/K trucks built at the Janesville assembly plant. The orifice tube on vehicles with
C60 (front A/C only) is located in the condenser outlet tube where it attaches to the liquid line. On vehicles with rear A/C (C69) the liquid line is split at
a junction block. One side of the split goes to the evaporator inlet while the other goes to the thermal expansion valve for the rear evaporator. The orifice
tube for these units is located on the evaporator side of the liquid line about three or four inches from the junction block. There is an access fitting
provided here for orifice tube cleaning or replacement.
Condensers for use on rear air models have a crimped outlet tube so that an orifice tube cannot be installed. Since the condensers are otherwise identical,
it is possible for a C69 condenser to be installed in a C60 vehicle. If this occurs, it will be necessary to replace the condenser.
PARTS INFORMATION
