HVAC 45 CLOSED DOOR TEST TEST DURATION: 10 min. INITIAL VEHICLE CONDITIONS The following conditions to be confirmed before starting the test: Vehicle stationary with all doors closed Engine Speed 1500 rpm FOR MANUAL HVAC Front Blower Speed 4th AC Switch ON Temperature Knob Max. Cool Vent Knob Chest Air Intake Recirculation air mode Run the vehicle in the above condition with all doors closed 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 reading of front vents should be as per the table given below: VENT AMBIENT TEMPERATURE < 30ºC (RH up to 40%) 30–35ºC (RH up to 40%) 35-40ºC (RH up to 40%) Above 40 º C (RH up to 40%) FRONT 9 C 10 C 17 º C 21º 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: FRONT VENT B. LEAK DETECTION a. Visual Detection: Look out for oil leaking from joints, as compressor oil is mixed with refrigerant it also circulates along with it, hence it might also leak at the joints. If leakage is found rectify, if not proceed with any of the test mentioned below to confirm leakage. b. Ultra fluorescent Leak Detector: The compressor oil used is pre-mixed with a fluorescent dye. Using a specially designed UV lamp inspect the components. If there is a leakage the coloured dye glows bright. This test can pin point small leakages. c. Electronic Leak Detector: This test is done using an electronic leak detector 1. Place the vehicle in a well ventilated area, free from wind, as leakage can be dissipated without detection in a windy area. 2. Follow the instructions issued by the manufacturer of the particular leak detector being used. 3. Commence searching for leaks by passing the detector probe around all joints and components. NOTE Refrigerant gas is heavier than air. 4. Insert the probe into an air outlet of the evaporator or into the evaporator drain tube. 5. Switch the air conditioning blower on and off at intervals of ten seconds. Any leaking refrigerant will be gathered in by the blower and detected. 6. Insert the probe between the magnetic clutch and compressor to check the shaft seal for leaks. 7. Check all service valve connections. 8. Check the condenser for leaks at the pipe unions. 9. If any leaks are found, the system must be discharged before rectification.
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