SAFARI

37 AIRCONDITIONING TROUBLE SHOOTING In order to find the causes of troubles as quickly as possible, it is necessary to conduct troubleshooting using a rational method and procedure. Before starting troubleshooting, first confirm the symptoms as follows: Start the engine and keep it idling. Then turn the blower switch and A/C switch on, and check the A/ C working conditions. Check the blower operation, the magnetic clutch operation and A/C outlet air temperature. After confirmation of symptoms, conduct the following rational method of troubleshooting. VISUAL AND AUDIO INSPECTION This can detect simple causes of troubles. Preparation: 1) Install the manifold gauge to the refrigeration cycle. 2) Prepare a multimeter and gas leak detector. CHECK MANIFOLD GAUGE PRESSURE Inspect the refrigeration cycle pressures - Low and High Side Standards: Low side - - 1.5 - 2.5 kg/cm (0.15 - 0.25 MPa) High side - -14 -16 kg/cm (1.37- 1.57 MPa) After the pressures to be okay, the remaining causes are on the electrical circuit and components. TROUBLESHOOT ELECTRICAL CIRCUIT To make easy, first star t the blower circuit troubleshooting and continue to the cooler circuit troubleshooting. a. Visual and Audio Inspection The simplest way to detect troubles is by looking and listening. 1. Is the drive belt loose? 2. Are the condenser fins covered with dirt and dust? In this case, the condenser cooling effect will be greatly reduced. As a result, the cooling capacity also will decrease. 3. Is the air filter clogged? A clogged air filter will reduce the air flow and’lower the cooling capacity. 4. Can oil stains be seen in the refrigeration cycle connections and joints? A place that shows an oil stain indicates that the refrigerant is leaking from that place together with compressor oil. 5. Check the quantity of refrigerant at the sight glass. 6. Abnormal noise Shaft Compressor Magnetic clutch Cylinder head Worn or damage bearing Contact between stator and rotor Loose mounting screw on stator Upside down blower motor Blower motor Crank pulley V- Belt Loose blower mounting Loose Pulley Improper tension Wrong mounting Idle Pulley. Worn or damage bearing Wrong fastening or mounting of bracket or clamp Wrong clearance Other piping parts