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When working on a vehicle’s air conditioning system, when it comes to replacing a component, the flushing process is the most important step to finish the repair and restore the system to full working order.
Flushing is an operation that removes used oil and all the solid contaminants from inside the components of a vehicle’s air conditioning system.
A clean air conditioning system is a healthy air conditioning system.
There are many possible scenarios when you might need to perform a flushing operation. You might have detected impurities in the system, need to change the compressor or have some fault with another component.
If you are replacing the compressor, you will need to flush the system once it has been reassembled and sealed to remove any impurities such as iron filings from inside the circuit. In fact, this can easily be caused by a worn dehydrator or hose. In this case, you will need to choose the right flushing method.
Two flushing methods are possible to achieve good results – flushing with a solvent or flushing in liquid phase. Flushing with a solvent is particularly suitable for a sealed compressor. Flushing in liquid phase, on the other hand, is recommended for cases where a dehydrator or hose has deteriorated.
Flushing in liquid phase:
This method consists of circulating liquid refrigerant around the system. This technique is both economic and ecological, allows to remove oil and solid particles from the system and can even remove the residues from flushing solvents. However, it is not suitable for cases where the compressor is not sealed.
It is important to follow 6 key steps:
Flushing with a solvent:
This method consists of circulating a solvent around the air conditioning circuit. This makes it possible to remove humidity and acidity from the system.
The solvent is added to the system under pressure and circulates around the system thanks to a pneumatic pump. The chemical reaction of the solvent absorbs all humidity and acidity.
It is important, once the flushing operation is complete, the check that the circuit does not have any leaks once it has been recharged with refrigerant. This check can be carried out using a leak detector.
There you have it. Your air conditioning system has been flushed and once more ready to be used.
Don’t forget that flushing is obligatory when replacing any component (particularly when the compressor is sealed).
SNDC designed and supplies air conditioning, heating, filtration and pressurisation systems for vehicle cabins
Since 1986, SNDC has been designing, developing and manufacturing
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