A/C - Compressor and System Changes
Models: 1993 Sentra/NXSection: Heater & Air Conditioner
Classification: HA92-013
Bulletin No.: NTB92-118
Date: December 15, 1992
1993 SENTRA, NX A/C SYSTEM CHANGES
SERVICE INFORMATION:
For the 1993 model year, the compressor will be changed from the type FK-II to type KC-50. Resulting from this compressor change, the high and low hoses, as well as the compressor bracket, will also be changed.
Additionally, the harness arrangement for the pressure switch will be changed. The former style utilizes a pigtail harness as part of the pressure switch to connect to the vehicle harness. The new style pressure switch will have no harness; the vehicle harness will connect directly to the pressure switch.
1. Description of changes:
A. Compressor
The KC-50 compressor features reduced weight (approximately 25%) and size, while offering the same level of performance as the FK-II.
The KC-50 suction port, located at the rear of the compressor, and discharge port, located at the front of the compressor, are opposite to the FK-II compressor, shown below.
The KC-50 has an integral pressure relief valve; the FK-II required a relief valve located adjacent to the compressor in the high hose flange.
For a given application, the compressor clutch/pulley assembly is more compact on the KC-50 as compared to the FK-II.
B. Compressor Bracket
Due to the compact nature of the KC-50 compressor, the mounting bracket is different than the FK-II bracket. The mount points of the compressor to the bracket are moved closer to the front of the engine (pulley alignment must be maintained; mounting points must be changed).
Easy visual identification is provided by the support ledges at the bottom of the new bracket. (SR20DE bracket shown. GA16DE bracket also has ledges)
C. High and Low hoses
Corresponding to the difference in port location, the configuration of the hoses is different for the KC-50 as compared to the FK-II.
As mentioned above, the pressure relief valve is deleted from the high hose and incorporated directly into the KC-50 compressor.
The high pressure (discharge) hose requires a stabilizing clamp between the hose and the compressor mounting point, as shown.
D. Pressure switch
As a running change during the 1993 model year, the pressure switch will be changed to eliminate the pigtail harness. The vehicle harness will connect directly to the pressure switch.
II. Effectivity of change
The compressor, bracket, and hose changes are effective with 1993 model vehicles, for both factory and dealer installed A/C.
The pressure switch change will be made by running change after the start of 1993 model vehicles, for both factory and dealer installed A/C.
III. Interchangeability
Interchanging of the compressor, bracket, and hoses is impossible as individual component parts are not interchangeable. Interchangeability as a parts set is not recommended, as future serviceability could be complicated on port and dealer A/C installed vehicles (all factory A/C vehicles will have, and parts catalog will show, "new" configuration).
Interchangeability of the pressure switch/liquid tank assembly is unconditionally two way.
The original GA16DE high hose (92490-64Y00) should be serviced with the revised high hose (92490-64Y01) and stabilizing clamp (92550-58Y00).
The low hose used for factory installed A/C (92480-64Y05) applies only to power steering equipped models. The Port and Dealer installed (kit) low hose (92480-64Y06) applies to both p/s and non-p/s models.
SERVICE NOTE
A limited number of 1993 "E" model Sentra vehicles (GA16DE without A/C) were produced using the 1992 compressor bracket (the alternator/compressor bracket is installed by the factory on all GA16DE models, with or without A/C).
This may result in '92 compressor and hoses being installed on a '93 vehicle. Therefore, before ordering service replacement hoses or compressor for any '93 GA16DE Sentra vehicle, visually inspect the compressor and hoses, and use the illustrations in this bulletin to assist in the determination of the correct replacement parts.