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radiator fan not working

This is a discussion on radiator fan not working within the How-To forums, part of the General Rhino category; This past weekend was our first trip out in our new Rhino.Ran well until our last day.Red light came on near camp turned off motor ...


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Old 11-14-2007, 05:38 PM
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radiator fan not working

This past weekend was our first trip out in our new Rhino.Ran well until our last day.Red light came on near camp turned off motor & noticed coolant in res was empty as well as radiator itself.After finding hose to motor was completly off I found where fluid leaked out from.Motor was too hot & it was dark so I waited till the am to fix.Placed hose back & clamped it refilled fluid ran it for about 15min light came back on & fluid was all over dash under hood.After a little diagnosing I noticed motor hot ,but no fan.I figured out why fluid was lost,But I can't figure out why fan is not working tried to look for blown fuse could not find it nor does the owners manual tell you much ,but take to dealer.I'm sure this is something I can fix .Any info or illustrations,pics would help.Is this a common problem or luck? I will post some pics of the new rhino. Thanks
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Old 11-14-2007, 05:57 PM
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MY guess would be that their was air in the cooling system when you filled it up again. If you don't get all the air out when filling up the radiator it will overheat even before the fan can get a chance to come on. If you take off the center engine cover their is a coolant bleed screw just on top of the water neck. Loosen that screw(bolt) and then fill up the radiator.
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Old 11-14-2007, 06:54 PM
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if there is no coolant the thermo switch does not read right. my rhino came with resivore hose loose. on my old raptor the fan was on a fuseable link in the harness.
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Old 11-14-2007, 06:58 PM
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Just to be sure the radiator fan itself isn't faulty, on the passenger side of the radiator, just above the coolant hose going into the radiator, there is a plug with two wires attached. Unplug the plug and take a piece of wire and connect the two terminal ends together.
This should cycle your fan on, if not your fan may be bad.
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Old 11-14-2007, 07:00 PM
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Quote: Originally Posted by robndeb View Post
Just to be sure the radiator fan itself isn't faulty, on the passenger side of the radiator, just above the coolant hose going into the radiator, there is a plug with two wires attached. Unplug the plug and take a piece of wire and connect the two terminal ends together.
This should cycle your fan on, if not your fan may be bad.

Yep... This is good advice.

Once you know the fan is working then bleed the coolant system as mentioned above. If the fan is not working take it to the dealer.
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Old 11-14-2007, 07:03 PM
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Quote: Originally Posted by robndeb View Post
Just to be sure the radiator fan itself isn't faulty, on the passenger side of the radiator, just above the coolant hose going into the radiator, there is a plug with two wires attached. Unplug the plug and take a piece of wire and connect the two terminal ends together.
This should cycle your fan on, if not your fan may be bad.
My bad, I should of mentioned that. Good point and an easy check.
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Old 11-15-2007, 08:48 AM
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Quote: Originally Posted by robndeb View Post
Just to be sure the radiator fan itself isn't faulty, on the passenger side of the radiator, just above the coolant hose going into the radiator, there is a plug with two wires attached. Unplug the plug and take a piece of wire and connect the two terminal ends together.
This should cycle your fan on, if not your fan may be bad.
Thanks for the advice,I will try it out this week.
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Old 11-15-2007, 09:30 AM
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I had the same problem right after I installed an aftermarket temp guage and had to cut the hose for the adapter. Once I refilled the radiator, it would go seriously hot, no fan, but hot light would come on. I opened the radiator cap and left it off with the engine running for about fifteen minutes and watched as bubbles of air came to the surface. After that, no problems and it stays within good range, fan comes on around 180.
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Old 11-15-2007, 09:36 AM
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Use a volt meter to find out why your fan is not coming on...

There is a fusable link (terminology may be wrong) located inside the battery box...

Also check all the fuses...

Disconnect the plug to the thermoswitch...

Turn on the ign switch...measure the two leads going to the thermoswitch...

One of the 2 leads is the ign/on +Vbattery to the fan...

If there is no +V on either lead...you most likely have a blown fuse and/or link...

If the +V is on one of the leads...short the leads together as someone already said...

If the fan does not run...the prblm is between the thermo-switch and fan ground...

Could be the fan motor itself...or the electical connections going to and from it...including the ground path...

In any event...the way to find the problem is with a voltmeter...

If +V is present at the motor itself...and the motor is well grounded...and the motor doesn't run...you need a new fan motor...

This is exacly why I chose to install a Fan BY-pass switch with a fan on/off indicator light to let me see the duty-cycle of the fan...and also to make sure I know the fan is coming on when it should...it also gives me the ability to override the thermo-switch in the event I want a head start on the cooling and/or in the event the thermoswitch happens to stick open...

Without a coolant temp gauge one doesn't know if the fan should be on or not...

The indicator light doesn't mean the fan is running...but it does mean the fuse and link are not blown...

Also, I firmly believe the oem sendor location is the single best location for a temp gauge sendor...

The reason is that an inline sendor will not heat up if there is no coolant...the sendor will indicate the temp of the housing it is in however...so if the coolant is gone...and the motor is extremely hot...a quality gauge with the sendor in that location will show it...

Installing a fan (actually a thermo-switch) by-pass switch with and indicator light is a very easy and good thing to do imo...

The specs on the thermo-switch are on at 167F and off at 154F....

I have a second guage inline at the output of the radiator and it reads 170 on and 160 off....of course...the coolant inside the radiator is going to be cooler or hotter than at the gauge in the hose...so those numbers are pretty consistent...

Typically I see a 5-15* temp drop across the radiator...depending on the cycle and if fan is on/off...

So on average, my guage on the input line reads 180F when the fan comes on as Phil says...I would expect that to be normal for everyone with a properly working stock system with 50/50 coolant...
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Last edited by tyrap; 11-15-2007 at 09:59 AM.
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Old 11-15-2007, 10:06 AM
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Quote: Originally Posted by robndeb View Post
Just to be sure the radiator fan itself isn't faulty, on the passenger side of the radiator, just above the coolant hose going into the radiator, there is a plug with two wires attached. Unplug the plug and take a piece of wire and connect the two terminal ends together.
This should cycle your fan on, if not your fan may be bad.

I did kinda the same thing so my fan stays on constantly. Does anyone see any problems w/ doing that??? thanks
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Old 11-15-2007, 10:13 AM
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Custom Creations sells a fan shroud. Powder coaded in any color you want. Runs 10-15% cooler and is way more easy on the wallet compared to buying a new radiator
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Old 11-15-2007, 10:31 AM
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Chris, got a link to this company???
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Old 11-15-2007, 10:52 AM
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Quote: Originally Posted by azmxer View Post
I did kinda the same thing so my fan stays on constantly. Does anyone see any problems w/ doing that??? thanks

Lots of people do that to get a head start...

Clearly the fan motor is not going to last as long...

I like my way ten times better...it is super easy and gives you the choice...also lets you see what's happening....

I am interested in a better shroud that fits the stock fan/radiator too...

Hopefully it will work with the Alba radiator as well...

Quote: Originally Posted by bayouatvman View Post
Chris, got a link to this company???

I googled custom creations...

1.4 million results....

First three pages were a bust...

A link would help....
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Last edited by tyrap; 11-15-2007 at 11:22 AM. Reason: Automerged Doublepost
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Old 11-19-2007, 01:11 AM
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Quote: Originally Posted by tyrap View Post
Lots of people do that to get a head start...

Clearly the fan motor is not going to last as long...

I like my way ten times better...it is super easy and gives you the choice...also lets you see what's happening....

I am interested in a better shroud that fits the stock fan/radiator too...

Hopefully it will work with the Alba radiator as well...




I googled custom creations...

1.4 million results....

First three pages were a bust...

A link would help....

The web site isnt up yet but its customcreationsatv.com but the phone number is....(909) 862 9353
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Old 11-19-2007, 10:10 AM
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Chris, cost?? Ty, let me know what you find out.
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