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Discussion Starter #1
I have done everything I can think of to solve this problem-removed thermstat,replaced water pump,checked radiator caps,flushed water system,removed all hoses for inspection,installed temp guage,bled air from system,jumped fan to run constantly. This mule will circulate water just fine for some time then stops, have to bled system-pumps sometimes for couple hundred yards then same thing again. From cold start does good for maybe a mile if you are sure it is circulating then same thing again. Carb. heater was stoped up but have good flow now. HOPE SOMEONE CAN HELP ME ON THIS.
 

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Did you actually pull the radiator and have it cleaned at a shop ?
What is actually happening is it blowing coolant out then overheating or is just over heating. if the first is the case you might have compression getting into the cooling system.
 

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Have you also checked the oil for contamination with antifreeze (blown head gasket), or oily foamy stuff on top of the antifreeze in the cooling system (same). You shouldn't run the engine for any amount of time with antifreeze in the crankcase--it breaks down the base of the motor oil and will ruin the engine.

Also--is the cooling fan running as the engine heats up? Mules have been known to have the temperature switch go bad on the radiator and will fail to run the electric fan to cool the radiator.

Post what you find so we can learn too.
MB
 

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Discussion Starter #5
98 Mule 2510-overheating

Thanks for the replys---I believe I solved my problem this morning. Reading through the threads last nite I saw a coment about water not around fan sensor to make fan run. This morning I jacked front up as high as I could-poured water in radiator-pulled carb heater return hose to water pump until ran full stream,left pressure cap under seat installed,let it set while I was gone.When I returned added a little water to the radiator untill it was overflowing and closed the system. I had installed a tempture guage previously. Inital start up-fan came on at 220% and then off at 190%.Now after driving some distance its on at 250% and off at 220% but runs good and is not overheating.Thanks to the treads for I had given up but it gave me one more thing to try Iwas not getting enough water in the system. Thanks again for your help.
 

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If you are getting air in your water system after it sets overnight, then check the tubing from the overflow tank and make sure it is not leaking air back in the system when the antifreeze cools and contracts. Other than that, it will be the cap seal or radiator is bad, and that requires a pressure test while looking for a slow air leak.

If it is the radiator, try Barr's Leak (no other brand will really work) and then working the Mule long enough for it to really warm up. Sometimes the glue that sticks the tanks to the radiator core begins to leak a bit of air and this will most often correct the problem and keeps it from progressing.
 
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