ENGINE 273 MPFI 169 ENGINE PROCEDURE FOR COOLANT DRAIN FOR TATA NANO (HVAC VERSION) Requirements : Regulated air supply at 1 bar (gauge) pressure. Please follow the below described procedure step-bystep; 1) Position the vehicle on a horizontal level ground / surface / car lift. 2) Allow the engine to cool down close to ambient temperature. 3) Open the radiator pressure cap (Fig. A) & loosen the radiator drain plug (Fig. B) to drain the coolant in the suitable vessel/tray. 5) Disconnect the recovery bottle vent hose at the radiator filler neck side (Fig. D) and drain the coolant from recovery bottle in the suitable vessel/tray. 4) Loosen the de-aeration port (Fig. C) located near the heater which can be accessed by opening the bonnet at the front of vehicle to drain further coolant from HVAC circuit through radiator drain plug. 6) Tighten the radiator pressure cap and also reconnect the recovery bottle vent hose. 7) Remove the de-aeration vent plug fromHVAC deaeration port and fit the special adaptor as shown in (Fig. E) on the de-aeration port for applying compressed air to drain coolant fromHVAC circuit. Fig. A Fig. B Fig. D Fig. C
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