NANO

170

ENGINE 273 MPFI

8) Apply 1 bar (gauge) pressure compressed air at

the special adaptor on de-aeration port to drain the

coolant through radiator drain plug. 9) Finally close

the radiator drain plug completely.

PROCEDURE FOR COOLANT REFILLING & DE-

AERATION FOR TATANANO (HVAC VERSION ):

Please follow the below described procedure step-by-

step.

1. Ensure all the hose joints are properly clamped

and the radiator drain plug is completely closed,

but the HVAC de-aeration port is open.

2. Take specified quantity of fresh premixed coolant

(in the ratio 50:50 Antifreeze coolant and De-

mineralized water)

3. Open the radiator pressure cap.

4. In the engine OFF condition, fill the coolant slowly

through the radiator filler neck. While the coolant

is being filled, check that air, air bubbles and the

coolant flowing through the HVAC de-aeration port.

Close the de-aeration port when the coolant (free

from air bubbles) starts flowing, then continue

coolant filling up to the radiator filler neck. (Note:

if the coolant does not flow out of the HVAC

de-aeration port in step 4,even after filling the

coolant up to radiator filler neck. Start the engine

and keep it in idle till the coolant flows out of HVAC

de-aeration port. And then put off the engine and

close the HVAC de-aeration port completely.)

5. Fill the coolant in the recovery bottle up to the

FIRST FILL / REFILL level and fit back the recovery

bottle cap.

6. Start the engine, switch on the AC and do ~ 5

times tip in of the accelerator pedal to allow forced

circulation of the coolant. Replenish the coolant

level in the radiator filler neck. Repeat the above

procedure few times, until there is no further coolant

level drop in the radiator filler neck. (Caution: During

tip – in do not hold the engine at higher rpm, as

hot coolant may spill out of the open radiator filler

neck.)

7. Hold the engine at idle for few minute, switch on

to the cab heater mode. To ensure that coolant is

flowing through cab heater lines, check for hot air

flow. Replenish the coolant in the radiator filler

neck. If hot air is not coming repeat step 6.

8. Now fix the radiator pressure cap and close it only

till first step (Note: Radiator filler neck has two

steps of locking for pressure cap)

9. Raise the engine speed to higher rpm for quick

warm-up, and hold till radiator fan comes ON

(caution: do not raise the engine speed to very

high rpm), keep the engine in idle till radiator fan

is switched OFF. Repeat the above radiator fan

ON-OFF cycle once again.

10. Allow the engine to cool down close to ambient.

Open the radiator cap and top up the coolant till

top of the filler neck. Close radiator pressure cap

completely i.e. up to the second step. Top up the

coolant in the recovery bottle up to the FIRST FILL

/ REFILL level, and fit back the recovery bottle

cap.

Fig. E