Neon L4-2.0L VIN C (1997)
Radiator Cooling Fan Motor: Description and Operation
Radiator Fan Control
Cooling Fan Modules
Fan control is accomplished in two ways.
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The fan always runs when the compressor clutch is engaged.
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The fan is also turned on by the temperature of the coolant which is sensed by the coolant temperature sensor. The coolant temperature sensor
sends the message to the Powertrain Control Module (PCM). The (PCM) turns on the fan through the Pulse Width Module (PWM). Switching
through the (PCM) provides fan control for the following conditions:
1. Fan will not run when cranking engine no matter what coolant temperature is.
2. Fan will run when the A/C clutch is engaged and low pressure cutout switch is closed.
3. At vehicle speeds over 40 mph, fan will run only if coolant temperature reaches 230°F (110°C) and fan will turn off when temperature drops to
220°F (104°C).
4. At vehicle speeds under 40 mph, fan will run when coolant temperature reaches 215°F (102°C) and fan will turn off when temperature drops 200°
F (93°C).
5. To prevent steaming, the fan will run with engine at idle speed and only for three minutes, when ambient temperature is below 60°F (16°C) and
coolant temperature is between 100-207°F (38-97°C).
