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ghemmen · 07-01-2009, 05:42 PM

Have a low hour (320) 2006 Rhino 660 in very good condition I just purchased. Had a strange over heat issue this past weekend. Ambient temperature was 103 outside. The boys were trail riding for about an hour with no heavy payload. They called me and said that the Over temp light had come on and the Radiator overflow reservoir was overflowing the vent tube. They shut it down and left it. I went back out to diagnose the issue 30 minutes later. When I started the engine, the overtemp light stayed on on start up but the cooling fan was not running. I let it idle for a minute and the fan cycled on and the temp light would not go off even though the fan would cycle off and on every 30 seconds or so. Got the bike home and flushed the heat fins of the radiator with a garden hose. Seemed to be clear yet the temp light remained on. Exterior temp of the engine was 220- 260F (via a temp gun). Reluctantly sprayed the engine down with water and temp light went out and has not come on again. The boys have been riding a lot since then and the out side temp is getting up to 100 just about every day yet the Rhino has not overheated since. Is there a fan relay in the system that may be malfunctioning or am I off in space.

07-01-2009, 05:42 PM	#1 (permalink)
ghemmen 1/4 Throttle Join Date: Jun 2009 Posts: 14	Engine Overheat Issue Have a low hour (320) 2006 Rhino 660 in very good condition I just purchased. Had a strange over heat issue this past weekend. Ambient temperature was 103 outside. The boys were trail riding for about an hour with no heavy payload. They called me and said that the Over temp light had come on and the Radiator overflow reservoir was overflowing the vent tube. They shut it down and left it. I went back out to diagnose the issue 30 minutes later. When I started the engine, the overtemp light stayed on on start up but the cooling fan was not running. I let it idle for a minute and the fan cycled on and the temp light would not go off even though the fan would cycle off and on every 30 seconds or so. Got the bike home and flushed the heat fins of the radiator with a garden hose. Seemed to be clear yet the temp light remained on. Exterior temp of the engine was 220- 260F (via a temp gun). Reluctantly sprayed the engine down with water and temp light went out and has not come on again. The boys have been riding a lot since then and the out side temp is getting up to 100 just about every day yet the Rhino has not overheated since. Is there a fan relay in the system that may be malfunctioning or am I off in space.