45 AIRCONDITIONING A/C PERFORMANCE CHECK UP PROCEDURE STEP - I - OPEN THE DOORS - CHECK AND ADJUST POSITION OF: (a) FRESH/RECIRCULATIONCONTROL (b) AIR DIRECTION CONTROL (c) TEMPERATURE CONTROL (d) GRILL DIRECTION STEP - II - OPEN ENGINE BONNET - CHECK (a) CONDITIONOF CONDENSERSURFACECLEAN CONDENSER WITH LOW PRESSUREWATER IF REQUIRED (b) LEVEL OF COOLANT - TOP UP IF REQUIRED (c) BELTTENSION - USE BELTTENSION CHECKING GAUGE STEP III - CLOSE BOTH SUCTION AND DISCHARGE VALVES OF GAUGE MANIFOLD. - INSTALL GAUGE MANIFOLD (a) BLUE HOSE TO SUCTION SIDE (b) RED /ORANGE HOSE TO DISCHARGE SIDE. (c) YELLOW HQSE FREE TO AIR STEP IV - START ENGINE - CHECK AND ADJUST ENGINE RPM AT IDLING USE RPM METER STEP-V SWITCH ON BLOWER TO MAXIMUM SPEED. SWITCH ON A/C SWITCH STEP-VI CHECK AND ADJUST ENGINE RPM TO 1000 WITH A/C ON USE RPM METER STEP-VII CHECK PRESSURE CONDITION OF SUCTION AND DISCHARGE SIDE ON THE PRESSURE GAUGES OF GAUGE MANIFOLD. - USE GAUGE MANIFOLD - BETWEEN 1500 AND 2000 RPM AT AN AMBIENTTEMP OF 35-400 C SUCTION PRESSURE SHOULD BE -2-3 kg/cm2 DISCHARGE PRESSURE SHOULD BE15-18 kg/cm2 - CHECK SIGHT GLASS ON RECEIVER DRIER - IF REFRIGERANT IS ADEQUATE THE GLASS WILL BE CLEAR. - IF REFRIGERANT IS LESS THE GLASS WILL SHOW EXCESSIVE BUBBLES. STEP VIII IF REFRIGERANT LEVEL IS LOW (a) STOP THE A/C AND ENGINE (b) CHECK REFRIGERANT LEAKAGE BY USING LEAK DETECTOR AND SOAP SOLUTION. STEP IX - RELEASE ALL REFRIGERANT - REPAIR LEAKAGE AND CHECK AGAIN - VACUUM A/C SYSTEM BY USING VACUUM PUMP - RECHARGE REFRIGERANT STEP X - CHECK A/C PERFORMANCE - USETHE THERMOMETER - SIT IN THE VEHICLE - CLOSE ALL DOORS AND WINDOWS - START ENGINE - SWITCH ON THE BLOWER TO MAXIMUM SPEED - INSTALL THE THERMOMETER IN CENTRE GRILL - TEMPERATURE INTHETHERMOMETER SHOULD BE BETWEEN IN 100 C WITHIN 10 MINUTES AT AN AMBIENT TEMPERATURE BETWEEN 35 AND 400 C.
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