Defender 90 (LD) V8-4.0L (1997)
Refrigerant: Service and Repair
REFRIGERANT RECOVERY, RECYCLING AND RECHARGING
WARNING: The air conditioning system is charged with a high pressure, potentially toxic refrigerant. Repairs or servicing must only be
carried out by an operator familiar with both the vehicle system and the charging and testing equipment.
All operations must be carried out in a well-ventilated area away from open flame and heat sources.
Always wear safety goggles and gloves when opening refrigerant connections.
WARNING: Wear eye and hand safety protection. Open connections slowly in case liquid or pressure is present. Allow to bleed off slowly.
CAUTION: Overcharging air conditioning system will cause excessive head pressure.
An air conditioning portable Refrigerant Recovery Recycling Recharging Station for use with R134a refrigerant incorporates all the features necessary to
recover refrigerant R134a from the air conditioning system, to filter and remove moisture, to evacuate and recharge with the reclaimed refrigerant. The
unit can also be used for performance testing and air conditioning system analysis.
The operator must adhere to the equipment manufacturers' instructions.
Recovery and recycling
1. Connect a Refrigerant Station to the high and low pressure servicing connections.
2. Operate the refrigerant recovery system according to the manufacturers instructions.
3. Measure the amount of oil discharged from the system. Add an equal amount of new refrigerant oil to compressor before evacuation sequence.
WARNING: Refrigerant must always be recycled before reuse, to ensure that the purity of the refrigerant is high enough for safe use in the air
conditioning system. Recycling should always be carried out with equipment which is design certified by Underwriter Laboratory Inc. for
compliance with SAE-J1991. Other equipment may not recycle refrigerant to the required level of purity.
A R134a Refrigerant Recovery Recycling Recharging Station must not be used with any other type of refrigerant.
Refrigerant R134a from domestic and commercial sources must not be used in motor vehicle air conditioning systems.
Evacuation and recharging
1. Add refrigerant oil to compressor if necessary.
2. Renew the receiver/drier.
CAUTION: When a major repair has been carried out, a leak test should be carried out using inert gas.
3. Connect a Refrigerant Station to the high and low pressure servicing connections.
CAUTION: Whenever the refrigerant system is opened, the receiver/drier must be renewed immediately before evacuating and recharging the
system.
4. Operate the refrigerant evacuation system according to the manufactures instructions.
NOTE: If the vacuum reading is below 700 mm Hg, 28 in Hg after 15 minutes, suspect a leak in the system. Partially recharge the system and
check for leaks using an electronic leak tester. Check suction lines first, then run the compressor for 5 minutes and then check the high pressure
lines.
CAUTION: The system must be Evacuated immediately before recharging commences. Delay between Evacuation and Recharging is not
permitted.
5. Operate the refrigerant recharging system according to the manufacturer's instructions.
Refrigerant to charge system = 900 ± 30 gm, 32 ± 1 oz.
6. If the full charge has not been accepted by the system, start the engine and run it at 1500 rev/min for a minimum of 2 minutes. Switch on the air
conditioning system, open the vehicle windows, set the temperature control to cold and switch the blower to maximum speed.
7. Consult Refrigerant Station Manual for correct procedure to complete the charge.
8. Carry out the air conditioning system performance test.