TM 9-2320-272-10
2-45.
ENGINE COOLANT HEATER KIT (Contd)
(3)
Press PRESS-TO-TEST button (7) on engine coolant heater control box (5) to check operation of circuit.
Observe that indicator lamp (7) illuminates.
(4)
Set HI-LO switch (6) on engine coolant heater control box (5) to HI or LO.
NOTE
Select HI position if engine is cold. Switch will automatically change to LO
position when coolant temperature exceeds 195°F (91°C). Switch will
automatically change to HI position when coolant temperature drops
below 120°F (49°C).
(5)
Hold RUN-OFF-START switch (8) on engine coolant heater control box (5) in START position until indicator
lamp (7) illuminates.
NOTE
Heater will not operate if switch is moved to RUN position before indicator
lamp illuminates.
(6)
Move switch (8) to RUN, without hesitating at OFF, as soon as indicator lamp (7) illuminates.
2-235
