HVAC 17 D. CONDENSER AND RECEIVER DRIER CONDENSER CONDENSER The condenser is a heat exchanger used to cool the hot vapourised refrigerant. Also the refrigerant changes its state from vapour to liquid. The condenser is placed in front of the radiator behind the radiator is the fan used to draw in ambient air. CONDENSER SEALING DUCTS Sealings are used to guide the flow of the air to the condenser and also to avoid the hot air recirculating from the engine compartment to the condenser. RECEIVER DRIER (R.D) The receiver drier is integrated into the Condenser and has three main functions. i) It absorbs the moisture in the refrigerant. ii) It allows only liquid (high pressure liquid) to pass through to the TXV. iii) It keeps a reserve of refrigerant to accommodate fluctuating refrigerant requirements. E. ON VEHICLE INSPECTION (WITHOUT DISMANTLING HVAC UNIT) Alternatively following test can be conducted without dismantling the HVAC unit: 1. Switch OFF the HVAC unit and allow the HVAC unit to come to ambient temperature. 2. Open the glow box & lowering Glove box lid. 3. Disconnect the Pigtail connection.s 4. Measure the resistance it should match to the ambient temperature. Refer graph in Inspection topic. As given in the graph above (~ 5 Ohms or less for ambient temperature of 25ºC and above)
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