Valeooscope - Air Conditioning System Thermal comfort loop

12.3 The consequences of a lack of refrigerant The heat exchanges are produced by the change in state of the refrigerant fluid. System performance will deteriorate if the refrige- rant level is too low. g It is advisable to regularly operate the com- pressor in order to lubricate the various seals in the loop. This reduces the risk of leaks and helps to maintain the system performance. g Irrespective of the type of circuit, it is essential to operate the compressor for at least 1 or 2 minutes per month all year long. It is essential to check the sealing of the A/C loop during servicing operations.

12.2 The consequences of insufficient air flow The f low of air passing through the cabin determines the thermal exchanges in the sys- tem and, therefore, the performance of the air conditioning. Obstructing or reducing the air flow will immedia- tely impact the comfort of the occupants and have a damaging effect on the reliability of the system components. When servicing the system, it is essential to check the complete air circuit, from capture to extraction: g Extraction of any residue (leaves, etc.) from the air inlet circuit. g Replacing the cabin air filter. g Checking that the extractors are not blocked. Simple action can be taken to prevent humidity in the A/C loop: g Always follow an efficient vacuum procedure, covering optimum vacuum level and appropriate vacuum time according to the maintenance ope- ration g Secure the seals of all the parts whenever the loop is opened to prevent the ambient humidity from entering the loop. g Effectively filter the refrigerant fluid in the loop in the extraction phase. g Replace the drier element every 3 years, whenever the loop is opened and in the event of major repairs or an accident.

Valeo has a range of tools to test sealing and detect leaks.

Warning! If a major leak occurs in the system, never refill with fluid without first identifying the reason and origin of the leak.

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