Question about Polaris 2004 Sportsman 400

2 Answers

How to troubleshoot radiator fan not operating

Replaced temperature sensor fan runs when sensor is disconnected

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 46 Answers

Could possibly be the cdi unit is overheating/going bad.

Posted on Nov 23, 2014

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has answered 200 questions.


    An expert who has answered 20 or more questions within one hour.

  • Expert
  • 220 Answers

The temperature sensor completes a circut telling the fan to activate.The wire should be comming out of your fuse bank,going to the sensor then to the fan,and then back to a ground.Possibly back at the fuse bank. It sounds to me that your chasing the wrong wires,or possibly have one of your accessory wires plugged into the fan.Trace your wires carefully with an ohm meter.

Posted on Nov 24, 2014


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why the fan on 700 polaris sportsman 2003 wont start when hot

There is a temperature sensor on the radiator.If that doesn't work check wiring.

Oct 29, 2016 | Polaris ATV

1 Answer

We have a 2011 Polaris RZR 800. It overheated this weekend and was spewing antifreeze and water out. Fan was running

if You are clogged with dirt the radiator and the temperature sensor is OK . You have to open the radiator cap and start the engine in a heated condition if of antifreeze go small bubbles , then you need to replace the gasket under the cylinder head

Apr 25, 2016 | ATVs

1 Answer

The fan comes on immediately when the ignition is turned on, so I know it is not hot. What is likely the culprit?

To try to disconnect the plug of the temperature sensoron the engine block and turn the start. If the fans topped working, then the problem is in the temperature sensor

Oct 01, 2015 | Polaris 2004 Magnum 330 4X4

1 Answer

When my cooling fan kicks on it runs intermittently.

The fan will only run when it needs to. It's on a sensor. The only time mine comes on is if I'm hauling something

Sep 09, 2015 | Polaris 2013 Sportsman 500 HO

1 Answer

2000 400 grizzly fan cycling on and off and quad overheating. What can cause the fan to cycle ? And how do i troubleshoot the issue ?

Sounds like your heat sensor is bad most are attached to the radiator in the Cooling make sure the fans are not the problem..after the engine is warm enough to turn on the fans locate the sensor and unplug it then using a jumper wire "paper clip or any small wire " as a bypass connect the two wires together "the plug end" the turn on the switch..the fans should run as long as the switch is in the on position..if it does your sensor needs replaced...note if you are out where there is no help and the fans are shutting off and the engine is running hot..just bypass the sensor until you can replace it..Just make sure it shuts off with your ignition switch off..or the battery will drain..good luck

Oct 22, 2014 | ATVs

2 Answers

Uxv500 atv is running hot

This is a 500 4x4 and the fan is not coming on all the time causes it to run hot it's a 2012 done put new radiator and sensor on it used it yeasterday and had trouble with it could somebody please point me into right direction

Jul 31, 2014 | Kymco 2011 UXV 500 4x4

2 Answers

Peugeot 307 engine temperature - ECU fault

Is the fan turning on? When you say new switch, are you referring to the fan relay? Check fan fuse(s).

Jun 12, 2014 | ATVs

1 Answer

I have a 2006 Suzuki eiger 400 auto, It runs awesome for about half hour then shuts off assuming because it is running hot? Any thoughts? Fan has not kicked on.

Yup.It's getting hot.Check the fan relay is operable.Fans gotta run.Most likely a bad heat sensor tho.That's a water temperature sending unit that tells the relay when to turn the fan on.Ifya gonna own these toys,learn the basics on how to care for them.There is ALWAYS going to be something going wrong.Get a manual.

Apr 14, 2014 | Suzuki 2004 Eiger 400 4X4 Manual

Not finding what you are looking for?
Polaris 2004 Sportsman 400 Logo

435 people viewed this question

Ask a Question

Usually answered in minutes!

Top Polaris ATVs Experts

john h

Level 3 Expert

12650 Answers

Matt Olenzek
Matt Olenzek

Level 2 Expert

297 Answers

Wade Mobley
Wade Mobley

Level 3 Expert

475 Answers

Are you a Polaris ATV Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides