Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSISUZU1985TROOPER II L4-2254CC 2.3L SOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGSERVICE AND REPAIRRETROFITTINGA/C - R12 TO R134 RETROFIT PROCEDURESSERVICE INFORMATION
1985 Isuzu Trooper II L4-2254cc 2.3L SOHC
Service Information
1985 Isuzu Trooper II L4-2254cc 2.3L SOHCSECTION Service Information
BULLETIN NUMBER:
SB00-12-S004
ISSUE DATE:
JULY 2000
GROUP:
AIR CONDITIONING
R-12 TO R-134a A/C SYSTEM CONVERSION/RETROFIT PROCEDURES (Supersedes SB00-12-5002)
NOTE:
Shaded information reflects changes from the previous service bulletin.
AFFECTED VEHICLES
All models listed below equipped with air conditioning:
^ 1987-89 I-Mark (JT)
^ 1990-93 Impulse (JI), Stylus (JS)
^ 1987-91 Trooper (KT)
^ 1992-93 Trooper (UX)
^ 1989.5-93 Rodeo (UC)
^ 1988-93 Pickup (TF)
SERVICE INFORMATION
This technical service bulletin outlines the detailed procedures for air conditioning system conversion/retrofit from refrigerant CFC12 (R-12 or DICHLORODIFLOUROMETHANE) to refrigerant HFC134a (R-134a or TETRAFLOUROETHANE).
The owner should be reminded that there are no legal requirements in the U.S. to retrofit any vehicle produced using R-12. Vehicles manufactured utilizing R-12 A/C systems can and should be serviced with R-12 as long as it is available. If the owner requires or requests a retrofit to R-134a for a specific vehicle whose retrofit parts and procedures have been released in this bulletin, the owner shall pay all costs to perform the retrofit.
For all A/C system retrofit procedures, new receiver driers, refrigerant oils, refrigerant R-134a, and new caution labels are required. Depending on application, either R-134a service valve adapters or hoses equipped with the R-134 service ports are required in both the high and the low-pressure side. Follow the information outlined in this bulletin for the special procedures and parts information. When applicable, refer to the appropriate published workshop manual to supplement the procedures in this bulletin, such as system diagnostics, component location and service information.
PARTS INFORMATION
The listed parts are customer pay items and not covered by warranty.
WARRANTY CLAIM INFORMATION
Isuzu warranty does not cover installation labor.
All retrofit costs are to be paid by the customer.
SB00-12-S004
ISSUE DATE:
JULY 2000
GROUP:
AIR CONDITIONING
R-12 TO R-134a A/C SYSTEM CONVERSION/RETROFIT PROCEDURES (Supersedes SB00-12-5002)
NOTE:
Shaded information reflects changes from the previous service bulletin.
AFFECTED VEHICLES
All models listed below equipped with air conditioning:
^ 1987-89 I-Mark (JT)
^ 1990-93 Impulse (JI), Stylus (JS)
^ 1987-91 Trooper (KT)
^ 1992-93 Trooper (UX)
^ 1989.5-93 Rodeo (UC)
^ 1988-93 Pickup (TF)
SERVICE INFORMATION
This technical service bulletin outlines the detailed procedures for air conditioning system conversion/retrofit from refrigerant CFC12 (R-12 or DICHLORODIFLOUROMETHANE) to refrigerant HFC134a (R-134a or TETRAFLOUROETHANE).
The owner should be reminded that there are no legal requirements in the U.S. to retrofit any vehicle produced using R-12. Vehicles manufactured utilizing R-12 A/C systems can and should be serviced with R-12 as long as it is available. If the owner requires or requests a retrofit to R-134a for a specific vehicle whose retrofit parts and procedures have been released in this bulletin, the owner shall pay all costs to perform the retrofit.
For all A/C system retrofit procedures, new receiver driers, refrigerant oils, refrigerant R-134a, and new caution labels are required. Depending on application, either R-134a service valve adapters or hoses equipped with the R-134 service ports are required in both the high and the low-pressure side. Follow the information outlined in this bulletin for the special procedures and parts information. When applicable, refer to the appropriate published workshop manual to supplement the procedures in this bulletin, such as system diagnostics, component location and service information.
PARTS INFORMATION
The listed parts are customer pay items and not covered by warranty.
WARRANTY CLAIM INFORMATION
Isuzu warranty does not cover installation labor.
All retrofit costs are to be paid by the customer.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.