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Mule overheats
Yes, that's what appears to be happening. Coolant never gets to the fan switch until the air pocket is released and then coolant starts flowing.
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Mule overheats
Well then Dick, I'm sorry to be the guy to ruin your day.
The only viable source of that much air, and the overheating problem is likely a blown head gasket.
The symptoms you are describing are a classic head gasket leak problem.
The cylinder compression is forcing past the gasket and pushing air into the coolant, since the coolant is a closed system the air is trapped there and just builds up.
Try doing a compression test on the cooling system. It may not show, buty I bet you are loosing pressure in the cooling system.
The easy test is to try running the machine with the rad cap loose, if the air doesn't build up, (you might even see bubbles or foaming in the water) and it doesn't over heat you'll have found the problem.
If the headgasket is blown, you might also know why you were "given" instead of "sold" a Mule,  .
Best of luck.
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Mule overheats
Murf,
Does a blown head gasket show up with water in the engine oil or is that a cracked engine or could it be either?
kt
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Mule overheats
Ahead gasket can show it self in many ways. Combustion into the cooling system. Coolant into the combustion chamber and or oil coolant mixes.
Are you losing coolant? When you burp the system is it full or do you have to add? Where is the rad is the temp switch, top or bottom?
If you are not loosing coolant you may want to get it drained an vacuum filled. If that does not work you will need to pressure fill it.
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Mule overheats
Thanks! As soon as it warms up (weather, not Mule!) I'll try it.
Dick
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Mule overheats
As Ace said it can manifest itself in many ways, depending on where the gasket has failed, or the block or head has cracked.
Best of luck.
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Mule overheats
Update... As I read the manual the other night...I know: a desperate last resort...I ran across something curious while looking for where the reservoir is. It has a required level. Hmmmm.... Well, I just found the reservoir...under the seat...and...it's empty. So I brought it up to level, topped off the
system at the radiator (at another filler cap at the front, NOT the same as the filler cap at the engine and res) and let it warm up. It does seem to be circulating. I ran it for a while, let it warm up and then drove it around pretty hard. No red light. No overheating stink.
It still seems like it's pretty hot. Do these engines run hot?
Again, thanks for your help.
Dick
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Mule overheats
Does the fan come on now? If not, I'd suggest you redo the procedure posted earlier. Sounds like when the engine coolant cools off, it sucks air into the system by way of the reservoir.
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Thanks, I'll try it again.
Dick
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Had very much the same problem.
Could be one of these problems.
Coolant system is subject vapor lock.Work very hard to remove any and "ALL" air from the system.Lift the front very high if you have to. Get it all out or it wont be nice.
I had to find on the right side a very small temp switch/guage that did not work on mine. Two small plug in wires. Bypass them and see if your fan comes on. If so its your always off temp switch.
Sounds like you have air.----------- Jack it up high.
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