HVAC 20 C. REAR AC UNIT The rear AC unit is similar to the front HVAC unit, only difference being that there is no Heater Coil. It is mounted in the right D pillar. It consists of a Blower, Evaporator Coil and TXVSince the TXV blocks the flow of refrigerant when there is no load on evaporator (for working of TXV refer the previous section ‘Evaporator Coil and TXV), it eliminates the need of a separate shut-off Valve. As this is an auxiliary unit, it cannot operate independent of front HVAC. For rear AC to operate front HVAC should be turned ON. D. COMPRESSOR SPECIFICATION MODEL QS90 DISPLACEMENT VOL. 89 cm3/ rev. LUBRICANT SX10 or Equivalent QUANTITY 70+20 cm3 The Compressor used in this vehicle is scroll type compressor. This compressor has two identical scrolls arranged at 180º around a offset center; one of them is fixed (fixed scroll) and the other (orbit scroll) is turned at a constant attitude, so that the space made between the scrolls symmetrically around the rotating shaft moves from outside toward the center while reducing its volume; this is the principle of compression.
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