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#6416989 - 08/20/16 12:35 PM Kawasaki Mule overheating
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
Neighbor's mule is overheating. Engine runs fine. He says the cooling fan won't come on and it overheats pretty quick and blows coolant out the overflow/over pressure. I told him I'd have a look at it. Got to be: thermostat, fan, or radiator. Or a blockage.

You Mule owners, where would you look first? Whaddayathink?

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#6417160 - 08/20/16 03:22 PM Re: Kawasaki Mule overheating [Re: 603Country]
SniperRAB Offline
GRAMPS!!!

Registered: 03/26/12
Posts: 21059
Loc: Nurturing Biosphere Mothership
I don't have a Mule just a Polaris but a quick check of the Interwebs suggests this..


"If your fan is not coming on, chances are that someone did not get the air out of the cooling system. There is a switch in the radiator that controls the fan, if no coolant is in contact with the sensor then your fan wont come on and the engine gets hot. To solve this you have to run the Mule until it gets warm and then park it on a hill with the nose up in the air. Let it cool completely down then check your coolant level on level ground. 9 out of ten times that will solve the problem. Otherwise it is a stuck thermostat. However if it is diesel Mule....."
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#6417231 - 08/20/16 04:23 PM Re: Kawasaki Mule overheating [Re: 603Country]
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
Gas mule. New thermostat.

By golly, that might be the answer. My neighbor had it worked on by a shade tree mechanic. The STM replaced the fan, fan switch, and thermostat (says he did), and the problem wasn't solved. My neighbor is gonna think I'm a genius, and naturally I'll take full credit for the fix. :-)

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#6417241 - 08/20/16 04:31 PM Re: Kawasaki Mule overheating [Re: 603Country]
SniperRAB Offline
GRAMPS!!!

Registered: 03/26/12
Posts: 21059
Loc: Nurturing Biosphere Mothership
roflmao

There you go up

Think if he purges that air and gets the burp out, he is good to go and retop off the coolant level..
Good Luck Sir up
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#6417343 - 08/20/16 05:44 PM Re: Kawasaki Mule overheating [Re: 603Country]
tigger Offline
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Registered: 03/24/07
Posts: 4495
Loc: Round Rock, Texas
The fan is run by a thermostat that mounts on the backside of radiator, that is the problem. Your can test that by removing the two wires and hooking them to a test light with the ignition switch on the light should come one but you also the to check for vapor lock in the radiator lines. Been there and one that.
Sniper is also correct and if you look at the metal lines leading from the radiator there are bleed plugs and there is a bleed plug on top of the of the engin where the fuel lines come in. Place the mule on and incline with the radiator cap above the fuel line coming to the engine. remove the plug and fill radiator.


Edited by tigger (08/20/16 05:50 PM)
_________________________
Tigger
If it isn't white it is not a birddog.

KC
Lying is lying. Don't bitch about one doing it and condone another. That's called hypocrisy.
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#6419911 - 08/22/16 01:56 PM Re: Kawasaki Mule overheating [Re: 603Country]
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
Ok...ran it up on a slope, took the radiator cap off, filled the overflow bottle, cranked the engine. Then, as the engine warmed, air bubbled out for a very long time. We kept topping off the radiator. Finally ran out of bubbles, capped the radiator, and the fan came on. We drove around a while and no overheating. Looks like the problem is fixed. Thanks very much to Sniper and Tigger.

The guy that worked on the Mule for my neighbor replaced the fan switch, head gasket, thermostat, and maybe even the fan itself and didn't fix the problem. He didn't know to burp out the air. I don't think I'll tell my neighbor, but I really don't think the Mule really even needed to be worked on, other than burping it. He's out $1800. I think it best that I not tell him. He might stroke out.

Again, thanks much for the suggestions. They were good suggestions. Show up at my place and the beer is on me. Latest beer purchase is Pacifica.

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#6419960 - 08/22/16 02:23 PM Re: Kawasaki Mule overheating [Re: 603Country]
SniperRAB Offline
GRAMPS!!!

Registered: 03/26/12
Posts: 21059
Loc: Nurturing Biosphere Mothership
Originally Posted By: 603Country
Ok...ran it up on a slope, took the radiator cap off, filled the overflow bottle, cranked the engine. Then, as the engine warmed, air bubbled out for a very long time. We kept topping off the radiator. Finally ran out of bubbles, capped the radiator, and the fan came on. We drove around a while and no overheating. Looks like the problem is fixed. Thanks very much to Sniper and Tigger.

The guy that worked on the Mule for my neighbor replaced the fan switch, head gasket, thermostat, and maybe even the fan itself and didn't fix the problem. He didn't know to burp out the air. I don't think I'll tell my neighbor, but I really don't think the Mule really even needed to be worked on, other than burping it. He's out $1800. I think it best that I not tell him. He might stroke out.

Again, thanks much for the suggestions. They were good suggestions. Show up at my place and the beer is on me. Latest beer purchase is Pacifica.


Outstanding cheers
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#6420160 - 08/22/16 04:47 PM Re: Kawasaki Mule overheating [Re: 603Country]
PMK Offline
Extreme Tracker

Registered: 09/10/12
Posts: 4942
Loc: Central TX (Gtown/Austin)
I'd tell your neighbor in hopes he never uses that mechanic again... but that's me

glad you got it figured out
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"everyone that lives dies but not everyone who dies lived..."

~PMK~

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#6420371 - 08/22/16 07:34 PM Re: Kawasaki Mule overheating [Re: 603Country]
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
Well dang it, the neighbor just called. It overheated again, sort of, but this time the fan ran. Said the overheat light came on, but it didn't smell hot or seem overheated. Maybe I didn't get all the air. Supposedly there are some bleeders near the thermostat. I'll pull it back on the ramp, fill the radiator, open the bleeders and let any air escape. Then run it again to see if I could get more air out.

If I got all the air the first time, and air keeps showing up, it's got to be the head gasket. But, the neighbor says the shade tree guy put a new head gasket in it.

Could it be the temp sensor in or on the radiator?

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#6420401 - 08/22/16 07:57 PM Re: Kawasaki Mule overheating [Re: 603Country]
SniperRAB Offline
GRAMPS!!!

Registered: 03/26/12
Posts: 21059
Loc: Nurturing Biosphere Mothership
Repeat the process then if continuies replace that T stat sir and look for Voids or holidays in that new head gasket...

REALLY hope he didn't get any debris down in there...
At this point...

I would roll back up and say..

We will meet you half way...I will supply parts, You Labor and I watch...shake hands and you hAVE EVERYTHING NEW . So Sorry and hope it gets resolved before season..


MY 10 cents, chingly in that gasket and getting air and creating Burb...
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#6420410 - 08/22/16 08:04 PM Re: Kawasaki Mule overheating [Re: 603Country]
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
Where is the danged thermostat? Must be on the engine.

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#6426432 - 08/26/16 09:51 PM Re: Kawasaki Mule overheating [Re: 603Country]
cattle69 Offline
Pro Tracker

Registered: 02/15/06
Posts: 1512
Loc: san angelo
You can not get all the air out unless use the bleeder valve on an incline just had same problem with Polaris ranger. I also had to squeeze the hoses to help burp the air out, but not sure if that is necessary on a mule.
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President and cofounder of magical pellet club.

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#6427147 - 08/27/16 04:53 PM Re: Kawasaki Mule overheating [Re: 603Country]
603Country Offline
Extreme Tracker

Registered: 07/03/12
Posts: 4867
Loc: Central Texas
That's worthwhile info, cattle69. The guy and I are going to have another go at getting the air out tomorrow afternoon. I'll trace the water lines and find the bleeder valves (that's the plan anyway).

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#6429603 - 08/29/16 01:51 PM Re: Kawasaki Mule overheating [Re: 603Country]
PMK Offline
Extreme Tracker

Registered: 09/10/12
Posts: 4942
Loc: Central TX (Gtown/Austin)
are you sure the water pump impeller is circulating water? Thermostat put in backwards?
_________________________
"everyone that lives dies but not everyone who dies lived..."

~PMK~

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#6429861 - 08/29/16 04:27 PM Re: Kawasaki Mule overheating [Re: 603Country]
cattle69 Offline
Pro Tracker

Registered: 02/15/06
Posts: 1512
Loc: san angelo
If he replaced fan make sure fan is pulling air through radiator and not blowing air out. If it is blowing air outwards will need to reverse polarity (switch the wires).
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President and cofounder of magical pellet club.

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