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post #1 of 11 (permalink) Old 05-09-2010, 12:20 PM Thread Starter
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overheating problems

I resently inherited an overheating problem. I have checked to see if the fan works and it does. I removed the electrical connection on the rad and placed a wire between the two leads; the fan motor starts. When the engine is running and I take the rad cap off, I see no fluid movement what ever in the rad. Is there a thermostat on the 2007 660 Rhino pre EFI unit? If so where would they hid it. I thought that it would be on the drivers side where the thermostat housing goes into the engine but when I removed it there was nothing there. I bought this unit new so no one removed it ? full of questions and looking for advice . If you have run across this before please advise
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post #2 of 11 (permalink) Old 05-09-2010, 03:08 PM
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NO t-stat on the 660's

try the water pump?

are u going by the dummy light or do u have a gauge ?

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post #3 of 11 (permalink) Old 05-09-2010, 04:18 PM
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have you tried bleeding heair out of the system? I would try that first

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post #4 of 11 (permalink) Old 05-09-2010, 04:29 PM
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the water pump is bad maybe, some have had the stem ear break off and hence no water flow. also, the oil drive chain also drives the water pump.

it is under the pass side engine fan. it has an o-ring so you can remove, oil will come pouring out so drain first.


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post #5 of 11 (permalink) Old 05-10-2010, 12:39 AM
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move the oil cooler out of the way of the radiator while ur at it, put it up under the hood

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post #6 of 11 (permalink) Old 05-10-2010, 10:01 AM
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Whats indicating you overheated? Temp Light? Gauge? At idle the water pump doesnt move much water. And if the engine is vapor locked it will not move water either.



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post #7 of 11 (permalink) Old 05-15-2010, 07:35 AM Thread Starter
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after about 10 minutes more or less steam starts rising off the radiator. I tested the fan and it works. Found that the dealership doesnt know anything as they told me there was a thermostat in the D$%^ thing. So now I am down to 2 items , either the thermo switch or the water pump but my money is on the thermo switch. Just need to figure out hoew to test it with out pulling it out of the rad. Any ideas. Same for the ewater pump how does one test that?
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post #8 of 11 (permalink) Old 05-15-2010, 09:11 AM
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Quote:
Originally Posted by wlvb View Post
after about 10 minutes more or less steam starts rising off the radiator. I tested the fan and it works. Found that the dealership doesnt know anything as they told me there was a thermostat in the D$%^ thing. So now I am down to 2 items , either the thermo switch or the water pump but my money is on the thermo switch. Just need to figure out hoew to test it with out pulling it out of the rad. Any ideas. Same for the ewater pump how does one test that?
This does not sound right to me...normally if they are hot they will be hot at the motor...not the radiator. I have seen them overheat and you can put you hand on the radiator. If its doing what you say the water is definatly circulating. Do you have a temp gauge? without one you are shooting in the dark.



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post #9 of 11 (permalink) Old 05-16-2010, 09:47 AM Thread Starter
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no gauge only the idiot lights on the dash. When I originally stated that I had no water movement . That is what it appears like at the rad filler point. I was/am under the impression one should see the same type of movement as you would with a automotive system with a thermostat. I removed the thermostat housing earlier only to find no thermostat. I starting the engine and cracked the bleed valve on the thermostat housing until antifreeze seeped out the fitting. Still lost and looking for a solution . If I were to insert a gauge would it be better at the engine side or rad or would it really matter?
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post #10 of 11 (permalink) Old 05-16-2010, 01:22 PM
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Quote:
Originally Posted by wlvb View Post
no gauge only the idiot lights on the dash. When I originally stated that I had no water movement . That is what it appears like at the rad filler point. I was/am under the impression one should see the same type of movement as you would with a automotive system with a thermostat. I removed the thermostat housing earlier only to find no thermostat. I starting the engine and cracked the bleed valve on the thermostat housing until antifreeze seeped out the fitting. Still lost and looking for a solution . If I were to insert a gauge would it be better at the engine side or rad or would it really matter?
Has your idiot light ever came on while riding? If so there is a good possibility that you have a blown head gasket. It will bleed pressure into the coolant system and creat a vapor lock at the head/thermostat housing area.

The water pump runs of the oil pump shaft that is chain driven...it doesnt move much water until the engine revs.

My personal prefrance is to remove the idiot light sensor and add your temp gauge in at the head. If you dont put it there I would probably but the kit utv crap sell and put it inline as close to the head as possible.

Hopefully this helps.

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