Econoline E350 1 Ton V8-7.3L DSL Turbo VIN F (1998)
Intake Air Heater: Description and Operation
To reduce white smoke during long idle periods at low ambient temperatures, the ECM will activate the intake air heater. Specific conditions must be
present before the heater is activated: ambient temperature must be below 0°C (32°F). Engine oil temperature (EOT) must be below 55°C(131°F)
vehicle power (IVPWR) must be between 11.8 and 15.0 volts