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Fan when turning on computer says fan not working

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Open the case to find out which fan it is. It might be that it is clogged with dirt. Clean out any dirt or lint in the fan, and try again. If it still does not work, replace the fan.

Posted on Jul 28, 2008


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I have a 93 honda accord . the cooling fan stopped working . i tested the fans to the battery an only one worked . if one does work will it make the other one not come on?

No, they work independently. The passenger side fan is the AC fan, and should be on anytime the AC is used. The driver's side fan is the radiator cooling fan, and is turned on by a temperature switch or by the computer when it deems the fan should be on.
If you jumpered them from the battery and one would not turn on, it would seem the fan motor is bad.

Jul 22, 2013 | Cars & Trucks

1 Answer

How to check if cooling fan is working properly

Start the engine with hood up. Wait for it to reach operating temperature. When it does, fan should cycle on for a few seconds, then off. If it doesn't come on, turn car off and make sure fan is free spinning-no obstructions. Be careful, if engine is warm, fan can come on and start running. If fan is free wheeling, jumper it from battery to fan connector to check fan motor. If motor works when given battery voltage but still won't come on as it should (usually the engine has to be quite warm to turn on the fan-as in stop and go traffic, or long idle times), you will have to check wiring at the fan relay, check if temperature switch to turn fan on is working properly, check if computer is signaling fan to turn on at the relay. You will probably need a wiring diagram if you don't find the problem as a bad fan motor or bad relay.

May 25, 2013 | 1995 Oldsmobile Achieva

2 Answers

Engine cooling fan only works when ac or defrost is on

if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

1 Answer

Why doesnt the cooling fan come on on my 1993 mercury topaz

You just asked about the one circuit that gives this backyard mechanic nightmares(lol).There is a relay to turn fan on, but whether it is controlled by a simple temperature sensor/switch on the engine, or by your ecu (engine's computer) I don't know.
Until you get a definitive answer from one of our experts here, there is a simple test you can do to make sure fan motor is good. Unplug the connector for motor and check for corrosion in the terminals of the connector. Plug it back in. Look on the thermostat housing or just adjacent to it, for a single wire connector. This is the fan sensor/switch. Unplug it and turn key to on. Fan should start. Be careful of fan blades when key is on: It MAY come on any time key is on. If it doen't come on it may be a bad sensor in the switch-supposed to build resistance as coolant temp. increases, then at certain temp. will turn fan on.
So, fan on? Replace that switch you disconnected. Or, still no fan? Plug sensor back in. Turn key off. Unplug the fan motor again, and use jumper wires from battery to fan terminal connector, just long enough to verify if fan works or not. If fan motor is good, there is a problem with the temp. sensor, or the relay (probably located in fuse box by battery), or the associated wiring, or the computer (IF your fan is controlled by the computer). Then you have just inherited my nightmare. But if fan does not work, you have found the problem. Good luck.

Nov 11, 2011 | 1993 Mercury Topaz

2 Answers

I have a 4 cylinder 2001 Toyota Solara. The temperature gage begins elevating after I have been on the interstate and exit to in-town speeds with standing at stoplights (within 3 minutes). So far, the...

If the auxilary fan is working it will help keep the radiator cooler but only if the ac/or defrost is on. Is the radiator fan coming on when it is suppose to? Have seen issues with fan switches on these which control the radiator fan.There are 2 fan switches on the driverside of the of the head one sits horizontal and the vertical.The ones I have experienced the most issues with are the horizontal ones not signaling to turn the hi speed fan on when it is needed.

Nov 08, 2010 | 2001 Toyota Camry Solara

2 Answers

My coolant is not working? when driveing it stays cool but as soon as i stop the fan dosnot kick in ad i over heat?

The coolant is working well, because the engine stays cool while driving. The problem is the fan relay, fuse, or the fan itself. Do you have AC? If so, turn it on and you should have instant running of the fan. The normal operation of the fan is: the engine thermal sensor tells the computer that it is getting hot which in turn tells the fan relay to turn on and that is supposed to turn on the fan itself. The fuse protects the high current wire to the fan. Try to turn the fan blades by hand--if stuck or very hard to turn, replace the fan motor. If you can't find the fan relay in the fuse compartment, it may be a solid-state device that is located near the fan motor. Chase the fan wiring back to the relay. Hope this helps!

Apr 30, 2010 | 1999 Jeep Grand Cherokee

2 Answers

How to test a radiator fan on 2005 PT Cruiser? More info, the ac seems to work, but poorly at low RPMs, like when at stop. Local mechanic said the fan wasn't coming on even at 1500 rpms. I swapped the...

To test the fan you need to unplug it and run your own power and ground to it useing jumper wires,if it works then it works,don't worry about hooking it up backwards it will either **** or blow but it will turn if it's good.Get your a/c coolant topped up if your haveing a/c problems at idle.

Nov 10, 2009 | 2005 Chrysler PT Cruiser

2 Answers

Cooling fan wount turn on

The temperature sensor instructs the computer to turn on the fan which tells a relay to turn on and it turns on the fan. The fan circuit also has a fuse that may be blown. The relay could be faulty. The coolant sensor may be faulty, but it also tells the computer to display the current engine temperature. If that seems to be working properly, then the sensor is probably ok. You say the fan sounds like it is running--have you looked at the fan motor while the sound occurs? The motor shaft may be turning inside the fan hub! If so, replace the fan blade--not the motor. Check with a wrecking yard for the part.

Aug 25, 2009 | 2002 Pontiac Sunfire

1 Answer

Grand Am 4 cyl. Car - Fan does not turn on

there is no computer to turn the fan on. it works on a thermal switch. so you have a relay to the fan. when the temp sensor gets hot it connects the circuit to the relay and then the fan is on. vary simple. and it works when the car is still hot but the key has been turned off till the switch cools off or some have a timer so it does not run for ever. so good guess is the temp sensor for the fan could be bad if the fan is working.

Sep 17, 2017 | 1996 Pontiac Grand Am

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