SAFARI

38 AIRCONDITIONING b. Manifold Gauge (Refrigeration Cycle) This is a method where trouble is detected and repaired by using manifold gauge. The manifold gauge indicates the refrigeration cycle high and low pressure side pressures on the respective gauge. Important Be sure to purge out the air in the charging hoses of the manifold gauge by using the refrigerant pressure in the cycle. 1. When Normal: Conditions * After the engine has warmed - up, check the following conditions (for HFC 134a). Engine Speed: 1500rpm A/C inlet temperature: 30' -35' C (86' - 95' F) Blower Speed: Hl Temperature control: Maximum cooling. Reference Gauge indications before A/c operation Both high and low pressure sides: 5-8 kg/cm’ (0.5 - 0.8 MPa) Caution *Precautions for ERR system Since the low pressure side pressure (within the evaporator) is controlled with the ERR, even when there is an abnormality, an abnormal value does not always appear directly in the pressure gauge. Pay particular attention to this when trouble- shooting. 2. Insufficient Refrigerant Problem Cause Check and remedy 1. Pressure is low on Quantity of, -Check for gas both the low refrigerant is leakage and repair pressure and the too small- -Replenishment of high pressure refrigerant sides If indicated pressure 2 Bubbles can be Gas leakage is near 0 when seen in the light connected to gauge, glass. evacuate the air 3. Air being blown after checking and out is not cool. locating of the leak. Fig. 53 - Normal condition Fig. 54 - Insufficient refrigerant