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Fan sender unit - Nissan Cars & Trucks

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Please test the voltage, for fan, relais, contacts , and tigh wires,look for corrosion, oxide, etc and repair or replace.
God bless you

Posted on Jul 25, 2013

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Temp gauge is not functioning correctly. Incorrect reading how do you correct this prob;lem

replace the temperature sender unit ( not the temperature sensor for the fan) and check for loose wire to the sender unit.

Mar 09, 2014 | 2006 Ford Explorer Sport Trac

1 Answer

Temp gauge not registering and cooling fan's run continuously

the temp gauge works of a different sender to the coolant sensor. IT has 1 wire only and changes resistance as the water heats up there by moving the needle on the gauge up the scale Check that the wire is tight on the sender unit and if so then replace the sender unit.. The difficulty in re starting the motor may be because it is over heating but you would not know this because of the faulty sender unit.

Jan 09, 2014 | 2005 Pontiac Grand Prix

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Cooling fans atay on always

pull the connection of the fan switch sender unit in the head (2 wires in a square looking plug) probably next to the temperature gauge sender unit. If pulling the plug stops the fan then the problem will most likely be in that switch keeping the ECM thinking that the engine is running hot.

Dec 23, 2013 | Chrysler Cars & Trucks

1 Answer

Why does my cooling fans run continuosly?

HI Daniel, The fan operation is controlled by a temperature sensor which is preset to operate a relay. The relay is usually a normally closed relay which when the cable is removed from the sender unit closes the relay and brings the fan into operation. Check the sender unit, the connection and the relay for defective operation. Regards John

Apr 20, 2012 | 1994 Subaru Legacy Outdoor

1 Answer

Cooling fan will not come on

If it has a temperature sender unit on the radiator you can test it to see if it's that which is causing the problem.
If it's a standard 2 wire plug on to the sender you just unplug it and quickly short the 2 wires in the plug together by inserting something like a paper clip. If the fan starts then you need a new sender unit. The sender it'self is only a switch that connects the 2 wires together when the correct temperature is reached. You may need to have the ignition on, but some fans continue after the engine is off and the key removed.

Feb 02, 2010 | 2000 Saturn SL

2 Answers

My temp gauge is not going and the fans are coming VW golf 2004

Hi, the fans are controlled from the engine ECU. The ECU recieves a signal fron the temperature sender unit which will then switch on the fans. The sender unit also controls the temperature gauge. Have a look at the fuses before you replace the temp sender unit as it might be a blown fuse. Most of the circuits are intergrated and running through different fuses. I hope this helps.

Jan 21, 2010 | 2002 Volkswagen Passat

2 Answers


The radiator fans work off a temerature sender unit that is located either on the engine itself or on the radiator tank it detects how hot it is, a bit like a thermometer.

This unit opens and closes through a bimetal strip enclosed within the unit it completes a circuit and allows power to flow to the electric fan thus cooling the vehicle.

I would suggest that you have this sender unit checked and repalced as necessary.

Nov 01, 2009 | 2000 Jeep Grand Cherokee

1 Answer

My engine fans do not turn on by themselves

temperature sender unit activates the fans !
find it & earth that connector with ignition on to see if the fans activate
If so replace sender unit
Cheers Rob

Aug 15, 2009 | 2000 Ford Taurus

2 Answers

I have a problem with my Mazda xedos 1995. The car keeps overheating and the fan does not kick in. Does anybody have any advise on how to check the fan and how to get it started again. Thanks in advance

Remove the fan sender unit wire which should be around the cylinder head the best way to locate it is to go by the wiring frm the fan to the sender unit.
Ones found , switch 'on' the igntion and then pull the wire from the sender unit , the fan should come 'on' there. if not thn the fan could have gone, probabely it could be the brushes inside, the best way to do is to replace the complete fan assy.

You can also check the fan by disconnecting the wires from around where its fitted there must be a connector, remove the connection and get two wires and connect it to the fan wiring and the others to the live and negative if the battery, the fan , if it' s ok should roar here, if the fans ok then the sender unit maybe faulty, you will have to replace it.
Good Luck.


May 06, 2009 | 1996 Mazda Millenia

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