K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Technical Service Bulletin # 431207E
Date: 970101
A/C - Retrofitting R-12 to R-134a
File In Section: 1 - HVAC
Bulletin No.: 43-12-07E
Date: January, 1997
INFORMATION
Subject:
Guidelines for Retrofitting R-12 Vehicles to R-134a
Models:
1984-94 Passenger Cars and Trucks (See List Below)
This bulletin is being revised with the following changes:
1.
Addition of all remaining GM vehicles, as listed.
2.
Format rearranged for easier use.
Please discard Corporate Bulletin Number 43-12-07D (Section 1 - HVAC).
Car/Truck Platform Coverage Starts:
1984 -
A, B, D, E, F, J, K, P, Y Carlines
1985 -
C, M, N, R, S Carlines
1986 -
H Carline
1987 -
L, V (Allante) Car lines; M/L, G, R/V, S/T,
P Truck lines
1988 -
T (LeMans), E (Reatta), W Car lines;
C/k, MED. Duty Truck lines
1989 -
Tracker
1990 -
U Van
Vehicles Not Covered: T (Chevette and T1000), G RWD, C RWD, and X Car
If a vehicle is not covered in the list above, GM's recommendation is that the vehicle continue to be serviced with R-12.
This bulletin outlines the detailed retrofit procedures, as well as providing background information on many components and procedures. It is important
to follow the bulletin, since each car and truck line has unique parts and procedures. However, the basic procedure is simple, and will become easier as
you complete more retrofits.
