Cooling fan not working properly

Tell us what make an model of vehicle you are using in your description of the problem. Blower not working can be caused by:
1. Blown fuse
2. Bad fan switch
3. Bad resistor speed selector unit (changes voltage going to fan motor.
4. Melted or bad connector, usually between switch and motor.
5. You have lost the ground from the fan going back to the battery. ie, a bad connection.
You will need a volt/ohm meter after you check the fuse.
Make sure you have battery voltage (about 12 volts) coming to the fan switch. If you do get 12 volts, follow it in the circuit going to the blower fan until you stop getting 12 volts. Where it stops is where the problem is. You can also start the test right at the blower fan with a meter to see if the fan is getting 12 volts and work backwards towards the switch.
Most likely cause: Bad resistor pack or connectors melted going to it, followed by a bad fan switch.
Good luck!

Be sure that your fan is properly grounded. The surest way to test is to take a positive 12 volt wire directly from the battery to the fan to ensure that it has actually failed prior to buying a new one. Check fuses under the hood as some vehicles have fuses under the hood, not all are located in the fuse box. On some rare occasions, there could be a fusible link providing power. That type of connector is replaceable, but you have to cut the link out and re-connect a new one once you conclude that the link has failed.
Good Luck.

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Try here

check a wire diagram cause the fan motors receieve info from the ECT and talks to the ECM.
must check diagram for proper routing of power.

separate problems. find a good size wire with 12 volts around the steering column or fuse box one that only has volts when key on run wire with12 volts to new switch from parts store and the other side of the switch o the windshield wiper motor hook to positve wire on wiper motor touch each wire till you find the right one don't touch black wires usually negative. you may want to run a wire straight ot he wiper motor to the positve side of the battery first to be sure the motor isn't burned up get you a cheap tast light at the parts store to check foe voltage they are worth their weight in gold as to the a/c does the fan inside blow? if so run a wire from the pos side of the battery to the wire that hooks to the a/c compressor if it clicks its working if not run a wire and switch just like the wipers. on the a/c get someone to sit inside turn key on all a/c switches on you should hear click if fan and compressor work and still no cool you need refrigerant bye from sunny austin tx

You have a electrical power shortage, when componets demand power it's not there [ that's why some componets slow or stop working ]. Start by cleaning the battery terminals and testing the battery to see if it holds a proper charge [ after fully charging, let the battery sit for a few hours and check the voltage = it should be at least 12 volts. If not, replace. Then check the output of the charging system = mininum of 13.8 volts to maxinum of 15.3 volts, & up to 78 ampress when @ maxinum charing. Then check the starter draw = should be around 260 amps, if it's higher then 300 amps. then replace.

Hi. You will need to acquire a volt meter, and test the blower motor for proper voltage(12v). If the motor is registering a 12 volt current(at contacts with the switch activated), simply replace the fan motor. If not, replace the fan relay, or resistor switch.

Check the cooling fan switch, if defective, it won't turn on cooling fan when needed.

check to make sure you have hooked up the fans properly. if you can ... test the fans by giving them 12 volts directly from the battery. also check that the fuse was not blown in the fan circuit. if it has and you replace it and it blows again ... you will need to track down the short circuit in order to fix the problem.

Hi!

The first thing you're going to want to do is get that trouble code read. Some auto parts stores do it for free or you can buy a code scanner. Likely culprit is going to be the cooling fan itself, the relay, fuse, or the wiring/connectors leading to/from the fan and PCM. It could also be caused by a failed coolant temperature sensor.

So get that code read and start some diagnostics. I would suggest you start by checking fuses, relay, wiring. Then use a digital volt meter to see if the fan is getting 12 volts. Then try hooking the fans up directly to the battery to see if they work.

If you need more help, just let me know. Good luck!