Engine Operation - Except 4.5L Engines NOTE: Air intake heaters (275 engines) and glow plugs (475 engines) operate automatically through the ECU. The Engine Preheater Indicator light on these engines, located above the key switch, should always illuminate when the switch is turned ON. In warm weather, the light illuminates briefly as a light check. In cold weather, the light remains on during the automatic operation of the air intake heater or glow plugs. Operating time depends on temperature. Do not crank engine until light turns off. 275-Series Engines with Air Intake Heaters and 475-Series Engines with Glow Plugs:
Turn key ON, but DO NOT crank engine until Engine Preheater Indicator light turns off. 3. Follow remaining steps as listed under earlier in this section. Additional information on cold weather operation is available from your authorized servicing dealer. RG,RG34710,5050 –19–25FEB03–2/2 19-10 021604 PN=108