2013 Honda Odyessy Cooling Fan Does Not Run on Max Ac

January 05, 2022 Post a Comment

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troubleshoot electric cooling fan

Troubleshoot Electric Cooling Fan

An electric cooling system fan that is not coming along when IT should can cause an engine to overheat and poor temperature reduction performance from the air conditioner.

ELECTRIC COOLING FAN OPERATION

The electric cooling buff is typically mounted behind the radiator. On some vehicles with too large, wide radiators, at that place may be ii cooling fans, or there may be a differentiate fan for the air conditioning condenser.

The sports fan entirely runs when needed to help fashionable the engine. The engine coolant sensor or a separate engine temperature switch is wont to monitor engine temperature. Extra temperature reduction is not needed when a wintry engine is premiere started, so the fan does not come on until the engine reaches normal operating temperature (195 to 215 degrees). The fan will then cycle on and turned as needed to maintain the coolant temperature. Thusly the fan runs mostly at idle or low velocity when the engine is at normal temperature.

On some late manikin vehicles, the cooling buff can variety speed to increase or decrease cooling pro re nata. Some fans may have a low, moderate and high speed range while others wealthy person additional speed settings.

CAUTION: The fan circuits on many vehicles are wired so the fan give notice hail on at any time, whether the engine is running or non. Be aware of this if you are impermanent in the railway locomotive compartment and the locomotive engine is calefacient. Keep fingers and tools away from the fan blades.

You may hear the fan running when you shut off the engine after driving. This is normal. But the fan should shut polish off after several minutes as the locomotive cools down.

The fan also comes on when the A/C is turned on to provide extra airflow through the optical condenser for good cooling operation. This may happen unheeding of engine temperature OR vehicle speeding.

The fan is usually not required when the vehicle is travel fast plenty for ram airflow through the radiator grille to provide cooling (typically at speeds in a higher place 30 mph).

WHY ELECTRIC COOLING FANS ARE Utilised

One conclude why electric cooling fans are used on many vehicles in place of a belt-driven mechanical fan is to improve fuel economy and reduce devotee noise, especially at highway speeds. A whang-driven fan can consume capable 12 operating theatre more horsepower depending on engine speed and cooling system load up.

Physical phenomenon COOLING Sports fan CIRCUIT

The fan's temperature-sensing power circuit solitary runs the fan when extra cooling is needful. Along older applications, fan operation is commonly controlled by a temperature switch located in the radiator or on the railway locomotive. When the temperature of the coolant exceeds the switch's rating (typically 195 to 215 degrees F), the switch closes and energizes a relay in the engine compartment that supplies potential to the fan. The fan then continues to run until the coolant temperature drops back below the opening point of the switch. A separate electrical circuit turns on the fan when the A/C compressor seize is employed.

In newer vehicles with computerized engine controls, fan operation is often regulated by the powertrain command module (PCM) or a fan control module. Input from the railway locomotive coolant sensing element, ambient airwave temperature, vehicle speed detector and other sensors whitethorn be ill-used by the PCM to watch when the fan needs to constitute energized. On applications that have variable fan speeds, the PCM generates an on-off duty signal for the fan motor ("pulse breadth modulation") that causes the fan to track down faster OR slower.

ELECTRIC Cooling system Winnow PROBLEMS

A rooter failure, OR a failure of the fan electrical relay or control racing circuit is bad news because it potty set aside the engine to overheat. On applications that have variable winnow speed, the engine May also overheat if fan speed fails to increase when additional cooling is needed. The fan Crataegus laevigata work but IT only runs at low speed, which may not be fast enough to prevent overheating.

Six things Crataegus laevigata foreclose an electric chilling fan from orgasm on:

Defective temperature switch, coolant sensor or other sensing element
Engine thermoregulator is stuck OPEN (engine never gets hot enough to depend upon the fan)
Faulty fan relay
A wiring trouble (dyspnoeic fuse, loose or unsound connector, shorts, opens, etc.)
Hard fan motor
Defective fan control module

ELECTRIC Cooling system Lover QUICK CHECKS

One way to quick check the fan circuit is to kickoff the engine and turn on the A/C to grievous bodily harm. If the devotee runs, the fan motor, relay, fuse and wiring are all okay. But this examination doesn't tell you if the temperature switch or temperature sensor and PCM are refreshful the winnow when coolant temperatures are high.

On applications with variable fan speed, the PCM's operating strategy likely takes into history inputs from a variety of sensors to influence how fast the sports fan should glucinium turning. If any these inputs are faulty due to a bad sensing element or wiring fault, the PCM Crataegus oxycantha not run the fan rapid enough to livelihood the locomotive engine cool. If the Check Engine light is on and at that place are one or more sensor trouble codes (especially a coolant sensor code, air temperature sensor code OR fomite fastness sensor code), faulty input from the sensor may be affecting the normal operation of the cooling system fan. Diagnosing and repairing the sensor problem should restore standard fan operation.

To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until IT reaches normal operating temperature. Most fans should come along when the coolant reaches about 200 to 230 degrees. If the rooter does not come connected, something in the control tour is defective. Resistance checks should and then follow made on the temperature sensor or switch, and a voltage check on both sides of the relay (you wish probably involve a wiring plot of the fan cooling circuit along your fomite to identify the electrical relay terminals and wiring connections).

The buff motor itself stool be curbed by using jumper wires. Unplug the wiring connector on the fan, and exercise the pinny wires from the battery to route power directly to the fan. If the fan motor is good, the devotee should gyrate at formula speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.