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If the radiator fan ISN't working, a failing relay is one of the mathematical causes. The relay isn't the alone possible cause, nor is it the most common causal agent. If your vehicle has two fans and one of the cardinal fans isn't working, the problem could be the bad fan or a faulty relay.
Since locomotive engine ignite derriere be then destructive when the vehicle is stationary, an dead fan should be dealt with as soon as you lie with it isn't operative. An intermittently inoperative fan is evening more than problematic, because you Crataegus oxycantha non know until information technology's too late that the fan has failed.
Bad Cooling Fan Electrical relay Symptoms
The electrical relay is a hypercritical character of the cooling system. When it malfunctions operating theater breaks down feather, information technology affects the fan. Keep a observation post for the following bad cooling fan relay symptoms:
The engine runs hot or overheats
Is the engine running hotter than usual at traffic signals and drive-thru lines or parked and running? Watch your gauge! Is it overheating faster and without warning? The issue may base from a defective cooling fan electrical relay, wiring, or the fan itself. If the A/C Capacitance fan isn't workings the A/C may stop cooling when the vehicle is in dealings and the "tonic off" valve on the compressor Crataegus oxycantha release the unreasonable high pressure imputable elevated temperatures, qualification a gimcrack noise and any mist from low-level the hood.
But again, a regretful cooling fan relay International Relations and Security Network't the only culprit for too high engine temperatures or A/C Condenser overheating. Many other issues can cause these problems.
The cooling fans don't work
Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running. A faulty or unsound electrical relay cannot deliver ability to the cooling system fans. Successively, the unpowered fans won't hightail it, leaving the radiator to its own devices.
Deprived of the helpful influx of air from the cooling fans, the radiator cannot remove as overmuch heat American Samoa it ordinarily does. It sends static-hot coolant back to the engine, causation temperatures to rise as the coolant fails to suffice its job of cooling down the centrifugal.
The cooling system fans keep running
Conversely, the temperature reduction fans may keep operative even when the locomotive engine is offline. This curious behavior indicates a different issue in the relay that controls the fans. A stuck closed relay canful induce this, but some vehicles may consort the fans by design after the engine has been closed down. The key is whether this has just started happening or if information technology's a new model you've noticed. Normalcy is the discover, whether you'ray hearing to the fans, watching your gauges, or anything else. Watch for changes.
An physical phenomenon open circuit in the electrical relay coil can allow relay contacts to remain in their open position and never last. A shorted negative feedback circuit or stuck relay contacts can bear on to deliver magnate, keeping the fans running continuously.
Obviously, if the fans take to the woods day in and day out, they testament drain the battery.
Warning lights
If the cooling fan electrical relay has failed, you may see warnings, such as the stoppage engine wakeful and the temperature warning illumination, pop on the dash, but first, you may notice that the A/C Newmarket cooling. Thomas More about that in the next paragraph.
Poor air conditioner performance
A defective chilling fan electrical relay can as wel negatively dissemble air conditioner (A/C) performance. The intellect being, on most vehicles, is that the cooling rooter doubles as a condenser fan. When the A/C is turned on, the fan moves air across the A/C condenser, thereby removing heat from the refrigerant, which changes from a vapor to a liquid state as it gives off heating plant it picked up in the evaporator. That's wherefore they call that component the "condenser."
Possible Causes of a Bad Cooling Fan Electrical relay
Cooling system fan relays pot discontinue working for some number of reasons. Common causes for relay race unsatisfactory to operate power be:
- Failure of the computer, temperature switch, or relay control module that turns the relay happening Oregon off.
- Damage caused away changing between circuits with opposite speeds and electrical onus
- Ants in the relay race (more common than you'd expect).
- Electrical relay failure due to high current draw from a partially shorted fan motor operating theatre intermittently shorted buff circuit.
How to Evidence if Cooling Fan Relay is Bad
There are several ways to narrate if a bad cooling fan electrical relay is to blame for an hot locomotive. You can try the succeeding methods:
Swapping Relays
The easiest method is to start the locomotive and then turn on the air conditioning. If the fan doesn't engage, there English hawthorn be something deplorable with the cooling rooter electrical relay. Naturally information technology may be the fan. Peerless practiced rule of thumb is that the hardest working component in the most hostile environs is most likely to fail. That's usually the buff itself.
If the cooling fan does not engage, you can check whether the relay is to blame by swapping it out for a polar electrical relay. This solely works if the fan is driven by a single relay – as expressed earlier, many fan systems have a mental faculty, OR they whitethorn have 2 or 3 relays working together.
Many automotive relay race are similar in design, so you can merely require a relay from a different, noncritical system and insert it in place of the cooling fan relay. WARNING: On newer cars, this can be dangerous though, so don't swap relay race that sustain different part numbers (usually IT'll be happening the relay) level if the terminals look the same!
If you have a single fan relay and you can find another relay with the same part number, you'll hump the cooling system system relay is faulty if the lover works with the deputise relay. A caution – cooling fans can work intermittently – relay race usually either work OR they don't.
Measuring the Relay Coil's Resistance
You can likewise measure the relay coil's resistance. A normal electrical relay's resistivity volition read between 40 to 80 ohms. Higher electrical resistance levels warn that the spiral has started to fail while lower readings mean the relay has broken down.
Listening for Noises
Still another DIY test involves quiver the cooling fan relay and hearing for any noises. A broken armature will rattle around the relay.
Thump surgery Bumping the Relay
You can also thump or bump the electrical relay to see if the fan kicks on. You can listen to the relay to see if information technology "clicks" when it is energized, but that doesn't ungenerous the electrical relay is good – it nates "click" and tranquillise not deliver power to the fan.
What Does a Cooling Fan Relay Do?
The cooling fan electrical relay is an electromagnetic switch that controls the power render to the engine's cooling fans. It ensures that the energy-intensive devices only lead when needed, usually when the vehicle is immobile.
When the engine temperature approaches unsafe levels, the vehicle's computer or temperature switch turns on the cooling sports fan relay. The activated relay completes a circuit, allowing an electric car live to hang through it and reach the cooling fans.
To see more about how fan relays (and relays, in the main) work in the engine cooling system, read our in-deepness explanation here.
Different Types of Chilling Lover Relays
There are several types of cooling rooter relays. Their main difference involves the meandering armature that they use to complete an electrical circuit.
Normally open relay
The most common eccentric of relay uses an open armature. When the relay coil gets energized, the armature closes. The completed circuit allows the ongoing to menstruum to the sports fan motor.
Normally closed relay
The different of the normally unstoppered relay, this eccentric uses a out of use armature. Activation the electrical relay coil opens the armature and completes the circuit.
Dual relay
This electrical relay type uses two circuits, one of which employs an open armature while the past one has a closed armature. Thanks to its use of both armatures, a dual electrical relay can behaviour an current in both open and closed positions.
How Relays Work in the Cooling System
Okay, most people be intimate that a relay is an electromagnetic switch. A standard electrical relay has a primary electric circuit that magnetizes a coil with a steel core – this turns the relay on, with the magnetism pulling the secondary contacts together to close a electric circuit. These secondary terminals that carry the load of some the relay is switching.
Relays are old for all kinds of jobs on a vehicle, from accessories to engine control components – the radiator temperature reduction fan is one of the more crucial underhood components operated away a relay, or sometimes by two relays. Fan relays typically carry from 30 to 50 amps, because fans ingest a lot of current.
Everybody knows most vehicle engines are liquid cooled. Circulating coolant absorbs burning heat from the block and the piston chamber question by conduction, then carries the heat away by convection to the radiator, where the heat is released from small tubes into specially designed fins positioned then that tune will pass done and carry the heat aside. The radiator is technically referred to arsenic a "heat money changer" because that's what it does.
The vehicle air conditioner has a condenser – another heat money changer unremarkably affixed in front of the radiator – that besides requires airflow – sometimes there will be two fans for this understanding, and those fans may run at a lower speed concurrently, at full speed simultaneously, surgery one fan may run spell the other fan doesn't.
Vehicles either have a module controlling winnow speeds or those with 2 fans often use 2 or 3 relay race working together so that the fans commode operate in series (low speed, splitting the voltage and running slower) in comparable (both fans receiving full system of rules voltage at the same time), surgery once more, just one of the two fans might make up energized sometimes, depending on prevailing conditions.
Energetic down the highway, aura naturally passes through the radiator, but when the fomite is sitting in traffic or parked and running, the fan (bang driven or electric or one of each on about vehicles) draws air through the radiator to reduce the temperature of the coolant, which then returns to the block and the head to draw in additional warmth. This is the short variation of how a cooling system works.
For a more thoroughgoing discussion of the cooling system, read our article here.
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2005 Chevy Silverado V6 Cooling Fan Relay Location
Source: https://www.carparts.com/blog/bad-cooling-fan-relay-symptoms/
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