A Review of Effective Methods and Practices to Diagnose the Vehicle AC System

Now a day’s mobile air-conditioning system health check at workstation / service station is done by, the feel of air flow by hands, and measures air vent temperature by thermometer. This procedure is not accurate enough to conclude whether the AC system performance is up to the mark or not. If problem persists then we instrument the vehicle with thermocouples, pressure gauges and capture the data it asks for using different equipment’s like data logger, data processor, which is time and money consuming.Hence, there is scope to improve the diagnostic method and establish standard procedure to minimize the time required for mobile AC system troubleshooting. Major issues faced in mobile AC system are as follows- – No refrigerant – Insufficient refrigerant – Excess refrigerant – Air entered in refrigerant circuit – Inadequate heat rejection / poor cooling. – Blower not functioning – AC compressor pumping failure – Restriction in refrigerant high pressure line – Excess opening of expansion valve – Blockage in expansion valve This paper documents method to diagnose mobile AC system by monitoring refrigerant circuit pressures and AC vent temperatures. Also it documents different remedies to rectify / troubleshoot the issue in minimum time.