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Radiator fan keeps coming on when ignition is turned on

Radiator fan comes on once ignition switch is turned on

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Check for coolant switch on radiator or around the thermostat housing could be unplugged or faulty.

Posted on Mar 29, 2014


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How to find and replace thermostat,toyota tazz 2005 model

Make sure your a/c switch is off if its on then the fan will come on when the ignition switch is turned on.

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How a cooling fan should work

The cooling fan is thermostatically controlled and enerised once the radiator/engine temperature exceeds that of the thermostat controlling th the fan. If the fan is coming on prior to the engine reching the operational temperature, then either the thermostat is not functioning or ha been wired incorrectly into the system the radiator was changed.`

Jun 09, 2012 | 2001 Toyota Camry

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My 2000 honda crv is overheating there are 2 fans and neither seems to come on

One fan should come on when the A/c is turn on. The other fan Will be the primary radiator cooling fan. This fan is controlled by a coolant temperature switch, a relay and fuse. Once the coolant temp, reaches 186 degs. the fan should come on. So you have to check the fuses for a burnt fuse, then you can check the coolant switch by un-pluging it and making a jump in the wiring with a paper clip and stick it into the connection. That should force the fan on. Hope this helps FixYa up.

Sep 03, 2011 | 2000 Honda CR-V

1 Answer

Radiator fan does not come on

check the fuse...
if the fuse is ok - the switch could be bad. remove the left side fairing, the fan switch is located on top of the left side radiator, disconnect the wire, put the ignition on and ground the wire to the frame. if the fan comes on the switch is bad,replace it

Aug 20, 2011 | 1998 Honda VFR 800

1 Answer

My bike is overheats when it is running still>

This is a thermal switch, located on the radiator, the wires from the fan will be looped into this, normaly located to one side in one of the ends, if you have a switch on the radiator it will have 2wires bridge these together with the ignition on taking care not to earth any of the wires out, and the fan should come on, i presume your temp gauge is working correctly, and you have coolant in the system, check when cold the level of coolant not in the bottle but in the radiator, also check the fan turns manualy by hand and if you have a fuse covering the fan that it is in good condition

Apr 22, 2011 | 2003 Honda VT 1100 C2 Shadow Sabre

1 Answer

Fan keeps coming on after engine turned off

Most cars with electric cooling fans incorporate a feature that will turn on the fan after the engine has been turned off until the radiator has cooled down. If it keeps coming on after cool down and is draining your battery, then you need to replace the switch that controls the fan.

Jan 10, 2011 | 2006 Mini Cooper

2 Answers

I have a 01' New Beetle my cooling fans come on high speed when the ignition is turned on and stay on while the motor is running. Have already changed out the coolant temp sensor, control module, radiator...

I finally fixed the problem. It wasn't the Water pump, or the Fan switch or the Green Temp Switch or the Fan Control Module but the "BLACK" NOT White, 2 Pin Thermal Switch 112c" It does sit in between 3 collant hoses where the upper radiator hose comes together with 2 smaller hoses. Kinda looks like a peace sign and in the center sits the 2 Pin Thermal Switch. It's not a AC Cut off switch which even the dealer tried to sell me and which I actually ordered from ECS tuning. The AC Cut out switch is "White" and even thou looks the same in size and form will not fix the issue. I was able to read the part number off the old switch which is 357919369F which when I looked it up on the ECS tuning web site did bring me to the right switch. Black with a green stripe on the top rim. I ordered that baby and it came in yesterday. Took the White switch out and put the Black switch in and guess what the fans no longer turn on when the ignition is in position 2 and now the fans come on when they are suppose to and don't sound like a jet engines afterburner. Simple 20 dollar part solved the problem. I think a lot of people are getting the wrong part from the dealer since this part is very hard to find. Everyone I asked wanted to give me that white sensor AC cut out switch but that isn't it. Here is the link to the correct switch hopefully it will help someone avoid a bit of frustration.

May 15, 2010 | 2001 Volkswagen Beetle

1 Answer

Do both fans come on at the same time? Especially with motor off?

They may or may not both come on. The fans are connected to a thermal switch that determines when they come on based on water temperature. It is built in such a manner so that at a specific temperature it turns one fan on,and if the water temperature climbs to a higher temp it will turn the second fan on. Correspndingly the fans will turn off in the same sequence as the temp in the radiator falls. The fans and their switches are connected to direct battery power bypassing the ignition so as to prevent heat damage to the engine when it is shut off after running. After you shut the car off the engine temp will continue to rise for a brief period of time before it starts to cool off and that is why the fans will come on and off, to keep it cool. Hope this helps.

May 10, 2010 | 1992 Honda Accord

4 Answers

Porsche 944 electric fan keeps running even when ignition is turned off

Replace the cooling fan relay, another person had the same issue, that's waht it was.

Oct 07, 2008 | 1989 Porsche 944

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