Coolant overflow boiling! Need help. - JeepForum.com
 
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post #1 of 4 Old 08-01-2015, 02:43 PM Thread Starter
rleff34
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Coolant overflow boiling! Need help.

Went pretty hard in the mud last night (enough to make my jeep now idle roughly ~75% of the time idling and what is probably mud in the clutch causing it to slip some)
Today I drove ~15 minutes to eat, then on the way home (an hour or two later) after only about 10 minutes of driving, I glanced down to see my temp guage max-ed out. Pulled over, and the coolant overflow reservoir was at a rolling boil also causing coolant to make steam and a puddle of coolant building on the ground. The radiator cap was not releasing any pressure. I also noticed the back of the radiator (facing the engine, in front of the fan) was caked with mud possibly causing it to heat up so much. I'm going to try flushing my entire coolant system and cleaning the radiator and replacing the cap, but please lead me in the right direction of fixing it. Thanks guys
(93 YJ Sahara, 4.0, 6spd, yadda yadda)

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post #2 of 4 Old 08-01-2015, 03:41 PM
DirtKar
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Lemme get this out of the way... I hate mud.
Having said that, no air flow equals a very hot tank. Since you saw a rolling boil in the overflow, that leads me to believe that your cap is in fact working otherwise it would not have happened. It's cheap insurance to replace it just the same. You're on the right track as far as clearing all of the fins on the radiator. Stay out of the mud!

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post #3 of 4 Old 08-01-2015, 04:51 PM
Mike Romain
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Your rad cap is working proper from the sounds of it. As mentioned, plugged up rad cores will fast cause the overheat. Easy fix anyway. There might be an inspection plate on the clutch you can open to get a pressure washer in there, have someone work the pedal when washing. And Never dump the clutch in a mud bog! You gotta be in the right gear first and go for it, no shifting.
Your back brake drums likely need cleaning out also and you need to grease all the grease nipples. I get amazing amounts of water out of pretty much everything greasable after a wet run.
Mud also = liquid sandpaper, it can polish up the fan belt pretty good making it slip and it eats the seals out if the fan clutch, so wash that area too.
Also be very aware that Jeeps don't have a high water vent on the tranny, if you were in deep, the fluid needs checking.
Mud running can get expensive and is a pain to clean up after, but it is fun. :-)

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post #4 of 4 Old 09-08-2015, 10:54 AM
SailerMatt
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Quote:
Originally Posted by rleff34 View Post
Went pretty hard in the mud last night (enough to make my jeep now idle roughly ~75% of the time idling and what is probably mud in the clutch causing it to slip some)
Today I drove ~15 minutes to eat, then on the way home (an hour or two later) after only about 10 minutes of driving, I glanced down to see my temp guage max-ed out. Pulled over, and the coolant overflow reservoir was at a rolling boil also causing coolant to make steam and a puddle of coolant building on the ground. The radiator cap was not releasing any pressure. I also noticed the back of the radiator (facing the engine, in front of the fan) was caked with mud possibly causing it to heat up so much. I'm going to try flushing my entire coolant system and cleaning the radiator and replacing the cap, but please lead me in the right direction of fixing it. Thanks guys
(93 YJ Sahara, 4.0, 6spd, yadda yadda)

Clean alllll the mud from your engine and underbody. Pain in the a**. You'll be driving down the road three months later and have a chunk of mud fall out from your Jeep

I don't know if it was boiling, or just letting off steam into the coolant by the breather tube making it bubble.

Nevertheless, you've got the idea right. Good thing pulling over quickly and letting the engine cool down. Give it a good scrub and replace the cap. Just a couple of bucks...

If you want to keep going through mud, raise your vent lines from both diffs and the tranny to your airbox. Its cheap and helps keep mud/water out. If your diff cover seals are bad in any way, then take off the covers and replace the fluid.
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