2006 Yamaha Rhino 660 - temp light coming on? - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 20 (permalink) Old 06-05-2019, 04:06 PM Thread Starter
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2006 Yamaha Rhino 660 - temp light coming on?

New to me Rhino 660 and the temp light comes in after some light use? New coolant and radiator checked. Fan is working also. Went to a dealership and talked to a maintenance guy and he said thermostat? But I didn’t think an 06 had a thermostat? Coolant air pocket maybe but I figured it would have worked out by driving it some since then. Just scratching my head as to what it could be. Thanks I’m advance!
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post #2 of 20 (permalink) Old 06-05-2019, 04:21 PM
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None of the 660s have thermostat, u need to bleed the system, dont count on it working its way out. There are youtube vids on how to properly bleed coolant lines on a rhino


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post #3 of 20 (permalink) Old 06-06-2019, 05:20 AM
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Also, the radiator can look clean and not be .... you will need to take stuff off if you can't get to it with your pressure washer and make sure it is clean all the way through.
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post #4 of 20 (permalink) Old 06-06-2019, 05:20 AM
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Be sure to jack up the front end to help get any air out. I always clean the radiator front to back and back to front.

FLOYD, SANDI & Sadie is the co-pilot. 05 660, 3000# VENOM WINCH, LED headlight Mod, 12' led light bar RZR seats, Resi shocks, SunF 26 X 9r X 12, CUSTOM PAINT(the rescue chopper can find us know)

"REMEMBER, SPEED KILLS, BUT IT WILL BE THE ONLY TIME YOU'LL DIE LAUGHING"
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post #5 of 20 (permalink) Old 06-06-2019, 05:49 AM Thread Starter
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Thanks all! Yeah I thought it didn't have a thermostate but the mechanic insisted, lol. Anyway, I can take that back no problem. The machine is at the farm so I am going to bring it back to the house and clean it. How is the best way to ensure I get it as clean as possible? Just use a power washer?

I don't believe this would make a difference but right after I got it I installed a big winch in the front (where it was supposed to go) of the radiator. 5K lb winch. It is a couple inches away from the radiator but any chance that addition could block some needed air flow?

Thanks again!
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post #6 of 20 (permalink) Old 06-06-2019, 10:04 AM
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Post a pic but it could b that if its dirty and u cut off some airflow its possible


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post #7 of 20 (permalink) Old 06-06-2019, 11:31 AM
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Doubt the winch is the problem, I just put dish soap in a spray bottle and saturate the rad both sides then regular water hose with spray nozzle. Have you tested the water to see if it's getting hot or just going by the temp light? you might take the rad cap off start the rhino and see if the water starts moving. If your running slow you may not be getting enough air flow. If I run into the wind I'll run 185 to 190 and if I turn and run with wind I'll hit 200 to 210 per my gauge the idiot light doesn't come on.

FLOYD, SANDI & Sadie is the co-pilot. 05 660, 3000# VENOM WINCH, LED headlight Mod, 12' led light bar RZR seats, Resi shocks, SunF 26 X 9r X 12, CUSTOM PAINT(the rescue chopper can find us know)

"REMEMBER, SPEED KILLS, BUT IT WILL BE THE ONLY TIME YOU'LL DIE LAUGHING"
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post #8 of 20 (permalink) Old 06-06-2019, 01:45 PM Thread Starter
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I haven’t tested the temp nor the coolant for that matter as i just know the light is coming on. She does smell a little warm to me though when it comes on. However I do plan to test both. The coolant seems an odd color to me - very light bluish color and very clean. Not sure who makes a bluish coolant though - Suzuki maybe ? Not really sure what type coolant to add back either? I wonder if it’s got way too much water in it and not enough coolant given the color. I’m gonna test that also. I’m gonna bleed the coolant system as well. Then clean the fins. There was a good coating of mud on the inside when i got it. While their appearance may look okay they could be clear. Would a power washer be too much power for cleaning the fins?
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post #9 of 20 (permalink) Old 06-06-2019, 03:49 PM
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My radiator had a spot the size of a golf ball stopped up with dried mud and the light came on ..... I took the front panel off, or radiator loose (don't remember) and washed it real good with A/C coil cleaner and pressure washer and no problem since.
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post #10 of 20 (permalink) Old 06-07-2019, 07:18 PM Thread Starter
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Messed with the Rhino some this afternoon. Installed a marine primer bulb which dramatically helped the starting. Next i took the radiator cap off and started the engine to see if the coolant was moving and it was. Next I jacked the front up about a foot and bleed the two bleeder valves off the coolant system. There could of been some small air pockets in the system but I don’t believe there was much if any air. Either way I can check that off my list.

The radiator over flow tank was maybe 3/4” low from being completely full. I topped it off and noticed the hose connecting the over flow tank to the top of the radiator had a kink in the line at the top. I tried to straighten it up but it needs to be replaced. There was a small Split in the over flow line at the other end near the bottom of the over flow tank. I ran it enough after that to get the fan to come on and make sure it was pulling air. Gonna try to clean the radiator next and see if that helps. Not sure what else to try after that.
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post #11 of 20 (permalink) Old 06-09-2019, 05:39 AM Thread Starter
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I know on ATV’s that I have had the cooling fan would run after your turned the key off until it got the temp under control. On the Rhino it only runs when the key is on - just curious if anyone has wired it to run with the key off? Most of our use will be short drives with stop and go work on the farm so I’m curious if that is also contributing to the temp light. While new to the Rhino I can’t believe that the temp light coming on given how little we are using it is normal. Has anybody ever installed a shroud or larger fan?
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post #12 of 20 (permalink) Old 06-09-2019, 09:43 AM
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2006 Yamaha Rhino 660 - temp light coming on?

There are fan override kits out there, have you thought about installing a temp gauge so u can actually see what its doing


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post #13 of 20 (permalink) Old 06-09-2019, 10:35 AM Thread Starter
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Yes. If cleaning the radiator doesn’t improve it then that’s next. Any recommendations on an easy but effective install for monitoring the temp?
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post #14 of 20 (permalink) Old 06-09-2019, 11:15 AM
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First step is to measure the water temp so you can determine if it's truly getting hot or it's something else. I found the quickest way to double check my water temp is to buy the radiator cap with an integrated manual temp gauge....I think I got mine from RockyMountainATV.com.

UTV parts vendors and Ebay have bolt-on aftermarket fan shrouds you can purchase that should help with airflow, in theory.....never tried them myself.
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post #15 of 20 (permalink) Old 06-09-2019, 02:12 PM
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Quote:
Originally Posted by HighDezRhino View Post
First step is to measure the water temp so you can determine if it's truly getting hot or it's something else. I found the quickest way to double check my water temp is to buy the radiator cap with an integrated manual temp gauge....I think I got mine from RockyMountainATV.com.

UTV parts vendors and Ebay have bolt-on aftermarket fan shrouds you can purchase that should help with airflow, in theory.....never tried them myself.

https://www.rockymountainatvmc.com/p...auge-p?v=10244 ($25)


Just checked Amazon prices - above much better deal!
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