01 Polaris Sportsman 400 fan test and switch replacement.

[@bigd7982]

Thank you for your time...... Appreciate you 👍 !!!

[@acoop4884]

At 3:22 of you video where you are pointing at the sensor... the black flat looking thing in the front of the radiator that is vertical is a petcock drain for the radiator... no mess no disconnecting the lower hose.... turn out to drain then turn back in.

[@Whitestrash]

@@acoop4884 yes I'm aware. It was siezed up. I didn't want to snap it.

[@brianweisenberg7878]

Thank you!

[@gofishingfishing]

Hello, I didnt see the link amazon in notes and if not there could you advise link. Thanks for video .

[@Whitestrash]

I'd advise going to "quadlogic" website and order from there. This Amazon one did eventually fail.

[@Whitestrash]

www.quad-logic.com/shop/sportsman-400/cooling-system-sportsman-400/sportsman-400-fan-switch/

[@greggroten]

Nailed it!! TY

[@dewaynemartin6437]

What is the black knob on the lower RF corner of the radiator?

[@Whitestrash]

That's the drain petcock. I don't like to use them on older machines because sometimes they can break. That's why I disconnected the lower hose.

[@davemalarik1394]

Looks like a drain plug to me.

[@williamhazeltine9314]

What is the blue plug dangling in front of radiator at 5 minutes in video

[@Whitestrash]

Headlight plug.

[@williamhazeltine9314]

Handle bar headlight?

[@Whitestrash]

@@williamhazeltine9314 No the headlight(s) in the front, above the bumper.

[@joehallam2810]

Doesn't the fan default on when that switch is unplugged? I tried unplugging it and my fan didn't turn on which I thought meant the fan motor is toast. But maybe it's just that thermal switch?

[@Whitestrash]

Unplugged it does nothing. Jumped together it stays on.

[@joehallam2810]

@@Whitestrash OMG dude THANK YOU! That just saved me a ton of diagnostic time. I'll make up a jumper wire and check it out. Thanks so much again!!!

[@sebastiencomeau3048]

Why do you have to drain the coolant? Couldn't you quickly screw in the new one and therefore maybe loose only a few drops instead of emptying the whole system?

[@Whitestrash]

You could try it. It is on the lower part of the radiator so it's gonna lose a lot of coolant in the time it takes to remove and replace it.

[@thebrothers4311]

So the fan can still be turned on when jumped, but the heat sensor portion was bad?

[@Whitestrash]

Yes the thermal switch can be bypassed. The fan will run all the time as long as the key is on.

[@thebrothers4311]

@@Whitestrash can the fan work if the sensor is bad though

[@Whitestrash]

@@thebrothers4311 yes. As long as the fan is in working condition.

[@ezio8591]

I got an 02 Trail Boss 325. My fan was working and I changed the thermistor and sensor switch that screws into the oil cooling fan. I noticed however that the fan never comes on after changing the parts. Maybe the oil never gets hot enough to kick on the fan? What are your thoughts?

[@Whitestrash]

You could heat the switch up with a heat gun to see if it works. Don't go crazy tho you don't want to melt any wires

[@ezio8591]

@@Whitestrash yes, thanks, I'm going to follow your two tests on the trail boss. I use Royal purple in there so maybe it keeps the heat down just enough where the sensor doesn't register the heat, I'm hoping that's all it is and the fan kicks on with the heat gun. Thanks again for the video.

[@ezio8591]

@@Whitestrash just thought I'd add an update. I unscrewed the sensor from the oil cooler and heated it up with low flame of a blow torch slowly and the fan came on so all is good. I don't know what the temp threshold is but it had to be pretty hot in order for the fan to kick on, to the point where I couldn't even touch the sensor. I doubt my oil will get that hot, idk. I'm using an aftermarket cheap sensor (Caltric) so maybe the threshold is higher and the OEM would be lower? Cheers.

[@Whitestrash]

@@ezio8591 awesome. Yeah I'm sure the threshold is different on cheaper ones, but if it works, it works. In my experience, air cooled machines with an oil temp switch hardly ever cycle the fan.

[@juanpabloguerrero2373]

The seller's name in Amazon is "Labwork"???? Thanks for the video 👍🏽

[@bill_mosienko]

Where do you fill with coolant? There's no radiator cap.

[@Whitestrash]

There is under the front rack and under the removable panel in front.

[@bill_mosienko]

@@Whitestrash No there isn't. I've looked absolutely everywhere. I've got all panels off. It must have something to do with it being a 335

[@Whitestrash]

@@bill_mosienko is the 335 even liquid cooled? They might just be air cooled. I don't remember..

[@bill_mosienko]

@@Whitestrash Well, there's a drain valve at the bottom. A hose going out to oil housing and another going to the crankcase (i believe)

[@Whitestrash]

@@bill_mosienko Yeah im pretty sure the 335 is air cooled. If you look at the side of the cylinder head and see fins and it's not smooth, it's air cooled and that is just an oil cooler.

[@bobluthart4681]

you do realize there is a drain plug right on the front of the radiator opposite the switch right?

[@Whitestrash]

Yes, it was seized shut

[@bobluthart4681]

@@Whitestrash I must have got lucky my 01 plastic drain came right out.

[@brandonharvey7939]

@@Whitestrash let the radiator heat up first and it should come right out with an adjustable crescent

[@ronaldwatson4233]

A frickin drain for the radiator in front of the switch. Duha

[@Whitestrash]

It. Was. Siezed. Shut.

[@brycedawson6951]

I got the same quad and my fan always runs is that normal?

[@Whitestrash]

No it's not. It should run only when it's hot. Look for a short between the 2 wires going to the switch.

[@hectorsanchez2146]

My Polaris 500 2005 I turn off the motor but fan still on what can that be

[@Whitestrash]

Is the wiring modified? Sounds like the fan is wired direct to the battery and not to the keyed on like it should be..

[@hectorsanchez2146]

Am not sure am gonna check and let you know thanks for answering

[@smallgaragehustle]

PCM aka power control module is bad. Known to catch fire if left alone. Contact your local Polaris dealer to have it replaced. Very serious.

[@christopherweaver8566]

what type of jumper wire did you use?

[@Whitestrash]

Just a short piece of 12 or 14ga wire. You could be extra fancy and put male blade connectors on each end of the wire.

[@pathulne4620]

Hey boss did the amazon switch work for you or did it fail?

[@Whitestrash]

It works, but it does have a lower temp threshold than the factory one. The fan runs longer than it should, but for the price it's decent.

[@oliviapike3691]

What’s the part number on that?

[@Whitestrash]

@@oliviapike3691 4010161

[@jasons4202]

Drian plug right in front of you and you pull the hose off 😂

[@Whitestrash]

I've had petcocks snap off before. I didn't wanna risk it.

[@brandonharvey7939]

@@Whitestrash plastic is only brittle when its cold but I just stuck a threaded galvanized pipe plug with teflon back in mine that you can pick up in the plumbing department of any hardware store for like $2, has a square head so you can get a wrench on it

[@Nwnomad410]

@@brandonharvey7939 who wants to go to the hardware store in the middle of a simple project?

[@brandonharvey7939]

@@Nwnomad410 if it was a simple project you wouldnt be searching youtube videos for advice