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12 v Fan not running

When plugging 220v fan not energize

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What fan, what make? What type of air con?

Posted on Nov 24, 2014


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Posted on Jan 02, 2017

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SOURCE: carrier model 38txa024300 ,condesor fan

If the fan spin freely then the capacitor could be bad. Otherwise, if it spin with difficulty then it need to be cleaned and lubbed.

Posted on May 22, 2011

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2006 Chevrolet Trailblazer I6 suddenly began overheating at idle. Parts replaced within the last 2 months: Fan clutch, Tstat, radiator, radiator cap

How about the water pump ? Who replaced the parts ? A qualified repair shop ? Were codes checked ?
The PCM controls the electro-viscous fan clutch engagement. The PCM regulates a 12-volt pulse width modulated signal (PWM) to the cooling fan relay. The PWM signal determines the ON time of the relay. As the commanded state of the fan clutch increases, so does the ON time of the relay. This ON time directly effects the amount of time the solenoid, which is internal to the fan clutch, is energized. When the solenoid in the fan clutch is energized, it opens the spring loaded valve and allows fluid to flow from the storage chamber to the fluid coupling of the cooling fan clutch, increasing the fan speed. When the solenoid is de-energized, the spring loaded valve closes, and blocks the path of the fluid to the fluid coupling of the fan clutch, reducing fan speed.
The fan has the ability to create a feedback signal, so the PCM has an actual fan speed input. This is done with a hall effect sensor internal to the fan clutch. The PCM supplies a 5-volt reference and a low reference to the hall effect sensor. The hall effect sensor returns a signal pulse through the cooling fan speed signal circuit in response to the relucktor track passing by the magnetic field of the hall effect sensor.
Was electrical tested before fan clutch was replaced !

Sep 29, 2016 | 2006 Chevrolet Trailblazer

1 Answer

Engine cold. Start engine reading says engine hot ac off. Fans run all time.

Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Ignition ON, verify with a scan tool that the control module is not commanding fan activation.
  3. Ignition ON, observe that the fans are not activated.
Your best bet is to take it to a ASE certified repair shop !

Jan 10, 2016 | 2009 Chevrolet Silverado 1500

1 Answer

Where is the radiator fan switch located on a 2002 oldsmobile intrigue

The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood accessory wiring junction block. The ground path is provided at G113. The relays are located in the underhood fuse / relay box .
So ,what's the problem Paul , car overheating ? Fans not working ?
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage from the cool fan 1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the cooling fan 2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan 3 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the cooling fan 3 relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
The PCM commands Low Speed Fans on under the following conditions:
Engine coolant temperature exceeds approximately 106?°C (223?°F).

When the A/C is requested and the ambient temperature is more than 50?°C (122?°F).

A/C refrigerant pressure exceeds 1310 kPa (190 psi).

After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:
Engine coolant temperature reaches 110?°C (230?°F).

A/C refrigerant pressure exceeds 1655 kPa (240 psi).

When certain DTCs set.


May 11, 2015 | Oldsmobile Cars & Trucks

1 Answer

Unit works fine set at 77 -- if lower to 75 or 73 coils condensate and run down into fan housing and drip out the bottom. i have checked for coils freezing up not the case, I have changed fan speed, c

With the tstat system off and fan in auto the fan still runs? ecm motors have a constant 240 and run by the low voltage. with the stat set properly verify voltage to the motor. if no low voltage only high then the module is likely bad. psc motors run when the speed tap is energized. maybe trace problem back to a bad relay. The 77/75/73 thing doesn't make sense unless it is then running in 2nd stage. Static pressure will increase fan speed and cause lots of issues with the fan pulling water off the coil and missing the pan. I have a piece if plexiglass I use so I can remove the blower door and cover with the glass to see what's happening. The coil is supposed to condensate, possibly slow the fan down in second stage. Check your static, check the subcooling, and also be sure you have the baffle/ shark fin in the coil set the right way for your application (horizontal right/ horizontal left) best wishes!!

Dec 24, 2017 | Celiera Celi 18000 BTU Ductless Mini Split...

1 Answer

110V fan has been plugged in 220V power socket

You may be lucky enough that the capacitor exploded from the 220 volt charge. You will have to enquire at an appliance repair shop for exact advice. Basically I would junk it and get the correct unit for the voltage and cycles in you area.

May 17, 2013 | Dyson AM02 Tower Fan

1 Answer

When I turn on my a/c the car starts to everheat

When ever the car overheats,it is always the best thing on your car,to check the cooling fans.When the ac is on,look to see if the cooling fans are running,and running fast,and smoothly.In your case,I am going to go out on a limb,and say they are not.First check for blown cooling fan fuse.Then,if the fuses are alright,check the cooling fan relays,most likely more than one.One prong,or spade coming out of the relay,is ground(where it plugs up).To make the relay energize,ground this terminal with a test light .Just like you are using the test light to check for 12 volts.When you touch the ground spade on the relay it will energize the relay to turn the fans on.Just pull the relay out of it`s spot,just enough to touch the spade.Do this with the ac on,and engine running.The clutch relay on most cars will energize the relay,but the ac compressor is working on your car,so it is either the fan relay,or the high side switch on the ac system that is bad.Try and see if the cooling fans,both of them,or one of them,will come on by them selves as the car warms up,with the ac off.The fan or fans should come on,and go off by themselves.Don`t let the engine overheat,keep a good eye out not to let that happen.If the fans never come on,then,the fan,or fans could be bad.You can test them by running wire from battery to the fan,and grounding to frame.Now the fuse,or relay being bad will also cause this.If a fuse is blown,then ,one or more of the fans are bad,and will have to be replaced.The fans cool the radiator for the engine and transmission cooling,and the condenser for the ac system.If the condenser is not cooled down,the ac freon will be to warm to cool the vehicle.If I can help,let me know.>>

Aug 26, 2009 | 2000 Honda Civic

1 Answer

How can you manually switch the heater to ac when the plastic motor actuater is broke?

run 12 volts to the plug on the compressor,usualluy green wire,right behind the belt pulley,will energize the clutch,wouldnt reccomend it unless you know what your doing ,needs to be fused and some kind of switch to control it,and the blower fan has to be on while is running,be carefull!

Jul 11, 2009 | 1998 Ford Taurus

2 Answers

My cooling fans do not work,what coul be the problem?

did you check fuse &relays if ok check engine temp sensor you 2 of them one on the engine &the other one is on the radiator

Jul 08, 2009 | 1998 Chrysler Town & Country

1 Answer

Secondary fan ac motor doesn't work

That fan comes on with the a/c compressor to assist cooling while a/c is in use....diagnostics must be performed with a/c on for that fan to be energized...start at the relay in the underhood fuse/relay box and check for 12 volts to fan when a/c compressor clutch is energized

Jun 28, 2009 | 1997 Lincoln Continental

1 Answer

Answer to your question will really help us if you have a temperature gauge because we would not know what is the radiator water temperature.

but anyway...

try these steps...

first check if there is power(12V) to your relay. i mean power that will go to the fan as the relay is energize.

you have 4 pins in the relay. two is for energizing it . and two for the contact that will close once the relay is energized.

jump these pins for the contact, your fan should run. if it did not and there is power, then there is no connection from your relay to your fan.

if it would run, then we can trace the other two pins.

one pin should be directly connected to +12.

test this by using your volt meter.

the the other pin should be connected to your temperature controller that should give negative signal once the engine is hot. the temperature controller should short it out with the engine block which is a source of negative signal.

that should complete the circuit and should energize the relay that would in turn run the fAN,...

i hope you can follow all the tests...



Aug 05, 2008 | 1998 Nissan Altima

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