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Message: <blockquote data-quote="gladiator175" data-source="post: 97910" data-attributes="member: 3833"><p>Morning all I have a 643 that's a little older but was working great. The machine engine seems fine. I haven't seen the engine overheat to the point where smoke is blowing out. The temp gauge was going all the way to hot after running it up and down the street in full throttle. Changed the temperature sending unit and the gauge - same issue. Checked the thermostat, put in boiling water opens fine. Removed water pump spins and looks fine. Good air flow to radiator. Radiator is fins are clean Oil cooler fins are clean 1. I shot the hoses with infrared heat gun and the pipe going to the thermostat housing was may 180. Nothing more. The bottom hose from the bottom of the water pump area. not all that hot either. 2. I put a 3/4" lawn hose into the top of the thermostat housing to see if water flowed through the engine. It did. 3. Prior to removing everything and with temp gauge showing hot I opened radiator cap and shot the antifreeze with infrared. It was well below 150. 4. with engine running and radiator cap open saw no water movement. Not sure if I really would. One thing of note, I have had the reservoir empty for some time...cant see how that would make a difference. Nothing unusual as far as color in coolant or oil. So I'm just stumped.</p></blockquote><p></p>