Aircon 39 www.aftermarketonline.net JULY/AUGUST 2025 Counterfeit products are a problem in many industries, but when they are fitted to a car, the dangers they pose can be amplified, particularly when it comes to driver comfort features, such as the air conditioning system Due to the central role that the AC compressor plays, it is often described as the heart of the AC system, which means it must operate correctly, and if it needs to be replaced, only a like for like unit is acceptable. However, how do technicians fitting a DENSO compressor know that the part really is genuine and of the highest quality and not a counterfeit product? In response, the brand is highlighting several of the features that technicians need to be aware of to ensure they are fitting a genuine replacement. Using real world examples, DENSO stresses that although counterfeits might be supplied in the traditional blue boxes, that is where most of the similarities to the genuine products can end DENSO’s products are naturally well-engineered but are also uniform in their fixings. One of the most obvious signs that the component could be counterfeit, is a lack of consistency when it comes to the fixings used on the unit. Using one example, the genuine compressor relies upon 8mm hexagonal flanged bolts for its assembly, whereas the counterfeit product uses a variety of different fixings – hexagonal and Allen bolts, neither with flanges. Furthermore, as shown in the photos, DENSO compressors also usually use Torx bolts for securing the inlet and outlet caps used to protect the ports pre-fitment, but the counterfeit product uses Allen bolts. Labelling is another area that provides clues to the unit’s authenticity. Things to look out for are the consistency of design, font size and appearance. For example, does the labelling match the layout and style of other DENSO products? Refrigerants and lubricants work at high temperatures and pressures, and components with precise mechanisms require cleanliness for optimal operation. Electrical components: The system consists of input collecting and signal generating sensors for performance control or protection. So, inspect for malfunctions within the electricity system and electrically driven AC components. Components replacement: Even if some of the components in the system demonstrate an apparent malfunction, never skip thorough and methodical diagnostics, before their replacement. This will help to eliminate the root causes of malfunction. Leaks & tightness: Tight joints within the system are necessary to maintain the correct charge and its efficient operation. Besides lower system performance and refrigerant losses, leaks expose other system components and the AC compressor to premature wear. So, leak detection is of the highest priority when servicing or repairing. System charge: Pulling a vacuum is a crucial service procedure. If pulled correctly, it removes possible moisture from the system and reveals its tightness, preparing and facilitating the charge of the refrigerant into the system. Recommended time and pressure - 60 minutes ( by ambient temp > 25°C / 77°F), 90 minutes (by ambient temp < 25°C / 77°F), 29.5 in.- Hg/-14,2 psi/ -0,98 bar or deeper. When charging the system, use only refrigerants and additives approved for automotive climate systems and strictly observe the vehicle manufacturer’s specifications. DENSO warns on fakes Mounting bolts discharge manifold are always 8mm flange bolts Allen mounting bolts are used for the discharge manifold
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