Isuzu 1999 RODEO Workshop Manual page 74

1A–46 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
When connecting the refrigerant line at a block joint,
securely insert the projecting portion of the joint portion
into the connecting hole on the unit side and secure with a
bolt. Apply the specified compressor oil to the O-rings
prior to connecting.
CAUTION: Compressor (PAG) oil to be used varies
according to the compressor model. Be sure to apply
oil specified for the model of compressor.
O-rings (2) must be fitted in the groove (1) of refrigerant
line.
Insert the nut into the union.
First, tighten the nut by hand as much as possible, then
tighten the nut to the specified torque.
850RW002
850RW003
850RW004