Unloading the air conditioning system

Attention: This operation must be carried out in specialized workshops.

When replacing any of the cooling elements in the air conditioning system, it is necessary to completely pump out all the refrigerant from the system.

With the ignition on, remove the safety cap from the low pressure side process fitting on the accumulator and connect the loading station or appropriate test set. If you are not using a loading station or equivalent, begin unloading the system by slowly connecting the gauge hose to the low side service fitting on the accumulator and draining the coolant into an oil bottle. The hose will slowly become stronger on the valve, and the refrigerant will begin to drain from the system into the container. If the coolant will not drain from the system, check the operation of the valve depressor in the hose fitting.

When the low side of the system is completely unloaded, check for pressure remaining at the high side fitting on the fluid line.



If pressure is found, try to unload the high pressure side using the same method as with the low pressure side. (This situation indicates that there is an obstruction on the high pressure side, and the cause of this must be found out and corrected before the system is evacuated and charged).


When the system is completely empty (the valve is permanently fixed and there is no steam leakage), measure the amount of oil drained and record the result.

If the measured amount is 15 ml or more, then before pumping and charging the system with refrigerant, the same amount of new 525-viscosity refrigerant oil must be added to the system, plus some more for replacement parts.

Adding oil to the cooling system

Adding oil to the air conditioning system should be carried out after unloading, but before pumping out the system as follows:

Remove the coolant suction hose from the battery outlet pipe connector.

Pour the correct amount of new coolant oil into the hose or pipe, and then properly reconnect the hose to the pipe.