FATC 44 15. MAINTENANCE A. PRELIMINARY INSPECTION a) AC SYSTEM PERFORMANCE TEST 1. Place the vehicle in a ventilated, shaded area free from wind. 2. Check that the surface of the condenser is not restricted with dirt, leaves, flies, etc. Clean as necessary. 3. Conduct first the open door test followed by closed door test as mentioned below: b) OPEN DOOR TEST TEST DURATION: 10 min. INITIAL VEHICLE CONDITIONS The following conditions to be confirmed before starting the test: Vehicle stationary with all doors open Engine speed 1500 rpm FOR MANUAL HVAC Front blower speed 4th Ac switch On Temperature knob Max. Cool Vent knob Chest Air intake Fresh air mode Run the vehicle in the above condition with all doors open for 10 min. At the end of 10 min insert the probe at the front vent and record the readings similarly insert the probe at the rear vent and record the reading. The readings of front and rear vents should be as per the table given below: VENT AMBIENT TEMPERATURE < 30ºC (RH upto 40%) 30–35ºC (RH upto 40%) 3540ºC (RH upto 40%) Above 40 º C (RH upto 40%) FRONT 15º C 20º C 26º C 30º C REAR 15º C 20º C 26º C 29º C RH: Relative Humidity. NOTE The above table is applicable if the ambient RH is 40%. For RH higher than 40% refer the graph below for acceptable temperatures: FOR FRONT VENT
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