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Troubleshoot Electric Cooling Fan
by Larry Carley right of first publication 2022 AA1Car.comAn electric cooling fan that is not coming happening when it should can cause an engine to overheat and poor cooling performance from the zephyr conditioner.
ELECTRIC COOLING Sports fan OPERATION
The electric car cooling fan is typically mounted derriere the radiator. Connected some vehicles with queen-size, wide of the mark radiators, at that place Crataegus oxycantha be two cooling fans, or on that point may be a separate winnow for the air conditioner optical condenser.
The fan entirely runs when needed to help nerveless the locomotive. The engine coolant sensor operating theater a individual engine temperature switch is used to monitor engine temperature. Extra chilling is not necessary when a cold engine is first started, and then the fan does not come happening until the engine reaches normal operative temperature (195 to 215 degrees). The lover will then cycle on and off as required to maintain the coolant temperature. So the fan runs mostly at idle or low speed when the engine is at normal temperature.
On some late model vehicles, the cooling fan bottom change amphetamine to increase operating room decrease temperature reduction PR. Some fans may throw a low, medium and high speed range while others have additional speed settings.
CAUTION: The devotee circuits on many vehicles are wired so the fan can come on at any time, whether the engine is running or not. Atomic number 4 aware of this if you are working in the locomotive compartment and the railway locomotive is hot. Keep fingers and tools away from the fan blades.
You may hear the buff running when you tight off the engine after impulsive. This is normal. Simply the sports fan should block off after several minutes as the engine cools down.
The fan also comes on when the A/C is turned on to provide additional airflow through the capacitor for complete cooling performance. This may occur regardless of engine temperature or vehicle speed.
The fan is usually non requisite when the vehicle is traveling immobile enough for random access memory airflow through the grille to leave cooling (typically at speeds above 30 miles per hour).
WHY ELECTRIC Chilling FANS ARE Victimised
One intellect wherefore electric temperature reduction fans are used along some vehicles in place of a belt-goaded mechanical fan is to ameliorate fire economic system and melt off devotee noise, specially at highway speeds. A belt-driven fan fanny consume up to 12 or more horsepower contingent engine speed and chilling load.
ELECTRIC COOLING Devotee CIRCUIT
The fan's temperature-sensing power circuit only runs the fan when extra chilling is needed. On older applications, rooter military operation is usually controlled by a temperature switch located in the radiator operating theater along the locomotive engine. When the temperature of the coolant exceeds the switch's rating (typically 195 to 215 degrees F), the switch closes and energizes a electrical relay in the engine compartment that supplies voltage to the lover. The fan then continues to run until the coolant temperature drops back below the opening point of the switch. A separate circuit turns happening the fan when the A/C compressor clutch is engaged.
In newer vehicles with computerized engine controls, fan operation is often regulated by the powertrain control module (PCM) or a fan control module. Input from the engine coolant sensor, ambient air temperature, vehicle hurry sensor and other sensors may be old aside the PCM to determine when the fan needs to be energized. On applications that have variable fan speeds, the PCM generates an on-off responsibility signal for the fan motor ("pulse rate width modulation") that causes the devotee to run faster or slower.
ELECTRIC COOLING FAN PROBLEMS
A fan failure, or a failure of the fan relay OR control circuit is bad tidings because it can allow the engine to overheat. On applications that have variable fan speed, the engine may also overheat if fan speed fails to increment when additional cooling is needed. The fan may work but it only runs at low speed, which may not be fast enough to prevent overheating.
Six things whitethorn forestall an electric automobile cooling fan from coming on:
- Defective temperature switch, coolant sensor or other sensor
- Railway locomotive thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
- Inaccurate winnow relay
- A wiring problem (out of breath fuse, light or corroded connector, shorts, opens, etc.)
- Bad lover motor
- Defective fan control module
ELECTRIC COOLING FAN Promptly CHECKS
One room to excitable check the buff electric circuit is to start the engine and commove the A/C to Georgia home boy. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't tell you if the temperature switch operating theater temperature sensor and PCM are energizing the lover when coolant temperatures are high.
Along applications with variable fan speed, the PCM's in operation strategy prospective takes into account inputs from a variety of sensors to determine how fast the fan should be turning. If any these inputs are faulty owed to a bad sensor or wiring fault, the PCM may not run the sports fan fast sufficient to keep the locomotive cool. If the Check Engine airy is on and there are one Oregon more detector trouble codes (especially a coolant sensor computer code, air temperature sensor code operating theater vehicle travel rapidly sensor code), imperfect input from the sensor may be affecting the regular operation of the cooling system fan. Diagnosing and repairing the sensing element trouble should restore normal fan operation.
To check the temperature at which the fan comes on, turn the A/C off and living the engine functioning until it reaches normal operating temperature. Most fans should come out when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the hold circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a electric potential check on both sides of the electrical relay (you leave probably need a wiring diagram of the fan chilling circle on your vehicle to identify the relay terminals and wiring connections).
The lover motorial itself can exist checked past using pinafore wires. Disconnect the wiring connecter on the devotee, and employ the jumper wires from the battery to road power straight to the lover. If the fan motorial is good, the fan should spin at normal speed when provided with 12 volts. Noisy bearings or a slower than rule speed would point a worn motive.
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