Isuzu NHR 4J Series, Workshop Manual

Page: 247 / 406

6B - 4 ENGINE COOLING
7.
Install and tighten radiator cap and start the engine. After
idling for 2 to 3 minutes, stop the engine and reopen
radiator cap. If the water level is lower, replenish.
WARNING:
When the coolant is heated to a high temperature, be
sure not to loosen or remove the radiator cap.
Otherwise you might get scalded by hot vapor or
boiling water. To open the radiator cap, put a piece of
thick cloth on the cap and loosen the cap slowly to
reduce the pressure when the coolant has become
cooler.
8.
After tightening radiator cap, warm up the engine at about
2,000 rpm.
Set heater adjustment to the highest temperature position,
and let the coolant circulate also into heater water system.
9.
Check to see the thermostat has opened through the
needle position of water thermometer, conduct a
5 minutes idling again and stop the engine.
10.
When the engine has been cooled, check filler neck for
water level and replenish if required. Should extreme
shortage of coolant is found, check the coolant system and
reservoir tank hose for leakage.
11.
Fill the coolant into the reservoir tank up to “MAX” line.