When your engine is running, it generates a worthy deal of heat is by burning fuel. The cooling action is designed to contol that heat, and cut of that action is the cooling fan. Rear-wheel drive vehicles can convenience the engine's capability to ride a mechanical fan, on the contrary the front turn operate requires an electric fan whereas the engine is mounted laterally in the engine compartment. When the cooling fan fails, it can engender overheating and engine damage.
Mechanical Fan Clutch
The mechanical fan and clutch used on rear-wheel propel vehicles is attached to the engine and driven by the saturate pump cestuses. When the fan clutch goes malicious, the fan doesn't match the velocity of the engine, and the fan is unable to pull air down the radiator. The most casual symptom of this is an engine that overheats while at a break comment or in slow traffic, on the contrary runs at orderly temperatures when the vehicle is Stirring at general speeds and air is forced over the radiator opening as the vehicle moves.
The fan clutch should enjoy resistence when spun while the engine is off. Provided it turns freely, it needs to be replaced.
Electric Fan Motors
The electric fans used on front-wheel manage vehicles and late-model rear-wheel drive vehicles is a lucid electric Engine powered by battery voltage supplied over a relay. Those motors are durable, on the contrary from era to age they engage in fail. Those motors switch on when the engine reaches a trustworthy temperature or whether the air conditioning is turned on.
A child's play crack is to turn the air conditioner on; the fan should come on in a rare seconds. Provided not, application a catechism brilliance to proof whether there is electricity getting to the fan. Influence supplied to the fan on one wire, and ground on the other wire indicates a deficient fan Engine. No gift supplied to the fan indicates defective electrical controls, such as a deficient switch or a damaged wire.
Now, unplug the relay, and test for power and ground at the relay port. You should get readings from the two power terminals and the two ground terminals. If so, replace the relay.
The thermal switch operates the fan according to engine temperature, and is switched to the ground. A faulty switch, relay, sensor, or on-board computer will result in an inoperative fan.
Troubleshooting
Troubleshooting is easy. Turn the air conditioner on and check for power and ground at the fan motor. If there is power on one wire and ground on the other wire with the fan unplugged, the faulty part is a fan motor. No power or no ground indicates a control-circuit fault.
Electronic Controls
Electric fans are powered by a relay that is turned off and on by either a sensor and machine or by a manageable thermal switch. Common symptoms of a bad control circuit is a fan that doesn't recieve power from the relay. The on-board computer controls the relay according to the coolant temperature sensor. If a power terminal gets no reading, check and replace the fuse. If a ground gives no reading, replace the coolant temp sensor or switch.Summary
Proper cooling fan operation is key to the performance and long life of your car's engine. Troubleshooting and repairing fan problems is easy and important.
