K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
85-89 - 97104794
90-93 - 97104793
Adapter, Low Side: Part of Hose Asm.
0-rings:
Receiver/dryer -
85-91 - 94154048
92-93 - 94461700
Switch/pipe - 94461902
Suction hose:
85-86: 1.5L - 97104799; 1.6L - 97104800
90-93: 1.6L - 97104801; 1.8L - 97104803
B. General Information
Several items affecting the performance and durability of the system should be considered:
1.
Performance
When performed properly, the retrofit from R-12 to R-134a will have minimal effect on the system's performance in most climatic conditions
found in the United States and Canada.
2.
Leakage
Experience has shown that most leakage in an A/C system is due to leaks at the joints, or through a small leak in a hose, usually at the coupling.
The R-134a molecules are smaller than R-12, and a small leak may result in a faster loss of refrigerant with R-134a. Because of this, it is very
important to leak check all vehicles using the J 39400 leak detector, BEFORE the retrofit is performed, and repair any leaks found.
"0" rings and hoses used in most GM vehicles are compatible with R-134a and do not need replacement during a retrofit. "0" rings or hoses
installed in previous repairs may have been of non-compatible materials if GM parts were not used and will be more likely to deteriorate and leak
than the original equipment materials. All "0" rings and hoses available through GMSP0 are compatible with R-134a. Remember that the normal
policy is to replace the "0" rings whenever a joint is opened for any reason.
3.
Desiccant
You may have heard that the currently used desiccant in the accumulator is not compatible with R-134a. Extensive testing has shown that it is, in
fact, suitable for use with R-134a, once it has been in service in an R-12 system. The accumulator in these models will not have to be changed
during the retrofit procedure, unless the vehicle is more than 5 years old. Vehicles more than 5 years old should have the A/D replaced to add new
desiccant for proper system drying.
In the event that an accumulator/dryer (A/D) needs to be replaced on a retrofitted system in the future, only A/D's with XH-7 desiccant should be
used. The service parts for the 1993 vehicles contain only XH-7 desiccant. The parts for the 1992 and older vehicles may contain either XH-5 or
XH-7. Parts containing XH-7 can be identified (see Figure 1) by 1) an "A" printed on the top of the A/D; or 2) if there is a label on top of the A/D,
there will be a square with an "A" inside; or 3) if there is a time code and date printed on top of the A/D just under the "Harrison" logo, the A/D
contains XH-7. A/D's containing XH-5 can still be used on R-12 vehicles.
4.
Improved Cooling Performance
There have been service bulletins issued in the past with information improving the cooling performance of existing R-12 systems. These bulletins
can also be used to improve the performance of retrofitted vehicles in high ambient temperature climates.
5.
PAG or V5 Oil Compatibility
Contrary to information published to date outside of General Motors, mineral oil and PAG or V5 oil ARE chemically compatible. The mineral oil
left in the system after reclaiming the R-12 can remain in the system with no harmful effects. However, the mineral oil will not mix with the
R-134a, and so will not circulate and perform its lubricating function. Testing has shown that most of the mineral oil will eventually collect in the
