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I have a 337 Bobcat excavator. Starts right up but runs only 5-8 minutes and heat gauge climbs to hot and machine shuts off. Changed thermostat and heat sensor but still have same problem. What to do
Re: I have a 337 Bobcat excavator. Starts right up but...
Check fan belt , fan operation , viscous fan hub
check and clean out the fins of the radiator as they may be blocked with dust or mud
have a compression test done to check for gasket or cracks
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trapped air. When temp needle climbs to 1/4 way, loosen coolant temp sensor to bleed off trapped air in cylinder heads. Air is gone once coolant starts to stream out, but only open slightly at a time. May have to do in increments as trapped air will cause rapid overheat
Thermostat is sticking or heater core is blocked.do not keep running it or it is going to ruin the engine. It is running hot regardless if is blowing cool or hot air. Do not keep using the car.
You vehicle has a cooling fan module that has three different speeds,It is mounted at the radiator,Run the vehicle at operating temperature, shut it off and use your hand and feel for cold spot if you have it its plugged
With engine cold, remove rad cap & check level in rad. Top it up if needed to 1 or 2 inches from top. Start engine, turn heater on (not defrost) and observe coolant level as engine warms up, add if necessary. Radiator fan should be off, and only come on when engine reaches normal operating temperature, for a short time, then shut off again. Let it run until that happens about 3 times, then put rad cap back on. If temperature gauge climbs up over normal toward hot, too much, shut it off. Do you now have heat? Is rad fan acting as I described? Let me know.
Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.
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