K 1500 Suburban 4WD V8-393 6.5L DSL Turbo (1994)
Expansion Block/Orifice Tube: Technical Service Bulletins
A/C - Updated Orifice Tube Service Procedure
File In Section: 1 - HVAC
Bulletin No.: 66-12-05
Date: August, 1996
SERVICE MANUAL UPDATE
Subject:
Section 1B - Heating, Ventilation and Air Conditioning - Updated Orifice Tube Service Procedure
Models:
1992-97 Chevrolet and GMC C/K Models with Rear Air Conditioning (RPO C69)
This bulletin updates Section 1B "Heater, Ventilation, and Air Conditioning" of the 1996 C/K Truck Service Manuals. The current Service Manual
information has been updated to include location and repair procedures for the orifice tube in Suburban models equipped with rear air conditioning (RPO
069). The current manual states that the orifice tube is located in the condenser outlet tube, and can be removed by evacuating the air conditioning
system and disconnecting the evaporator tube from the condenser outlet pipe. The orifice tube is then removed from the condenser outlet pipe using J
26549-E or equivalent. This information is correct for vehicles not equipped with rear air conditioning.
Vehicles equipped with rear air conditioning require a different orifice tube service procedure, as the orifice tube location is different (Figure 1). If the
Service Manual CCOT System Air Conditioning Diagnosis Insufficient Cooling Chart brings the technician to orifice tube removal, the following
procedure should be used:
Remove or Disconnect (Figure 1)
1.
Recover refrigerant. Refer to "Refrigerant Recovery" in Section 1B.
2.
The front evaporator tube from the liquid line near the junction block (Figure 1). It may be necessary to remove the air cleaner assembly on some
models.
3.
The 0-ring seal.
^
Cap or plug the open line.
4.
Orifice tube from liquid line using J 26549-E or equivalent.
