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Unread 05-25-2012, 07:39 AM   #1
riverhippy
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beat this jeep like a baby seal

since ive taken this jeep off the jack stands the ive noticed two things:

1) there is a loud whistle after it warms up. almost like a tea kettle sound.

2) the temp is running 250deg almost redlining after its run for a while.
it runs normal, even seee the gauge drop after thermostat opens up.

it flows normal thru the radiator. is it a bad sensing unit? bad thermostat? are these two issues related>

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Unread 05-25-2012, 07:42 AM   #2
mrmark
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Quote:
Originally Posted by riverhippy View Post
since ive taken this jeep off the jack stands the ive noticed two things:

1) there is a loud whistle after it warms up. almost like a tea kettle sound.

2) the temp is running 250deg almost redlining after its run for a while.
it runs normal, even seee the gauge drop after thermostat opens up.

it flows normal thru the radiator. is it a bad sensing unit? bad thermostat? are these two issues related>
Have you flushed the system? Is the fan working? The water pump bad? You said you see the thermostat open so the would probably not be it.
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Unread 05-25-2012, 07:45 AM   #3
gary69
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I would say the 2 conditions are related. If your truly running at 250 your wayy too hot. Check your coant level in your rad, and i would also replace your thermostat and radiator cap just because they are so cheap and would eliminate tem as a culprit. Take your serp belt off and check the water pump to make sure theres no slop in the bearings. Are there any coolant leaks that develop or steam coming from anywhere when its hot and whistling? Possibly under the water pump?
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Unread 05-25-2012, 08:04 AM   #4
Louie4
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I'd say you have a leak somewhere based on the whistling sound and high temp.

Like the tags BTW. I know I search for "hot girl with tat", "big guns", and "sex drugs rock and roll" at least once a week. Who doesn't?
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Unread 05-25-2012, 08:13 AM   #5
riverhippy
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Originally Posted by Louie4 View Post
I'd say you have a leak somewhere based on the whistling sound and high temp.

Like the tags BTW. I know I search for "hot girl with tat", "big guns", and "sex drugs rock and roll" at least once a week. Who doesn't?
haha....

ill check the pump, but its new. no leaks or steam. the rad level stays constant. and the whistling gets louder when i accelerate and stops when i turn the key off.

on my evinrude the high temp alarm would go off, does a jeep have that?
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Unread 05-25-2012, 08:42 AM   #6
Louie4
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Originally Posted by riverhippy View Post
on my evinrude the high temp alarm would go off, does a jeep have that?
Nope. Just a bunch of steam and no go.
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Unread 05-25-2012, 09:06 AM   #7
pete1991YJ
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You should verify that it is indeed overheating. If it is, then I wouldn't run it for any length of time like that. It would tend to cause other probs.

The whistling is more likely a vacuum leak IMHO since it stops when you shut it off.

Far as steam goes, its possible to have a coolant leak without seeing any steam. Check for bubbles in the radiator.

Possible causes/fixes would be clogged radiator - have it flushed or get a new one
bad water pump or fan clutch - I think you already got a new pump, right? Fan clutch, test that.
Thermostst you already know that is good.

Overheating can warp the cylinder head and make it leak the head gasket. Which would make it overheat even more. You might end up having to do that. For now, I would re-torque all the head bolts and manifold bolts just to be sure. If you notice anything unusual while you're up there, sing out!
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Unread 05-25-2012, 06:15 PM   #8
riverhippy
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Originally Posted by pete1991YJ View Post
You should verify that it is indeed overheating. If it is, then I wouldn't run it for any length of time like that. It would tend to cause other probs.

The whistling is more likely a vacuum leak IMHO since it stops when you shut it off.

Far as steam goes, its possible to have a coolant leak without seeing any steam. Check for bubbles in the radiator.

Possible causes/fixes would be clogged radiator - have it flushed or get a new one
bad water pump or fan clutch - I think you already got a new pump, right? Fan clutch, test that.
Thermostst you already know that is good.

Overheating can warp the cylinder head and make it leak the head gasket. Which would make it overheat even more. You might end up having to do that. For now, I would re-torque all the head bolts and manifold bolts just to be sure. If you notice anything unusual while you're up there, sing out!
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The radiator is less than a year old. how do i check the fan clutch?
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Unread 05-25-2012, 06:24 PM   #9
pete1991YJ
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The radiator is less than a year old. how do i check the fan clutch?
OK, the radiator is fresh, that's very good.

For the fan clutch, there's 2 ways: One, with the engine off and warm, grab a blade and give the fan a spin. It should not spin more than 1/2 turn by itself.

The other thing is to check the bearing in there - grab a couple blades and try to shake the fan or push it in and out - it shouldn't budge. It should have turning motion only.

Post back and let us know how it goes!
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Unread 05-25-2012, 07:55 PM   #10
4x4JB
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The two problems might not be related also. Check the manifold for loose bolts or leaks. My exaust manifold has a whistle that I have been meaning to FICA by tightening some bolts. As far as the heat problem. Like it was said before. Make sure it is indeed overheating. Good luck and don't blow a head gasket ;-)
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Unread 05-26-2012, 12:16 PM   #11
riverhippy
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Originally Posted by pete1991YJ View Post
OK, the radiator is fresh, that's very good.

For the fan clutch, there's 2 ways: One, with the engine off and warm, grab a blade and give the fan a spin. It should not spin more than 1/2 turn by itself.

The other thing is to check the bearing in there - grab a couple blades and try to shake the fan or push it in and out - it shouldn't budge. It should have turning motion only.

Post back and let us know how it goes!
should i remove the belt before i do these tests on the fan?
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Unread 05-26-2012, 12:28 PM   #12
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Originally Posted by riverhippy View Post
should i remove the belt before i do these tests on the fan?
You can spin the blades and check the clutch without removing the belt. Has the fan been roaring at all? Should be very noticeable if your engine is running that hot. If its running hot even at highway speeds, its not likely the fan clutch.
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Any video of the sound?
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Unread 05-26-2012, 12:35 PM   #13
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Something else to check would be the rotation of the pump, hopefully you got one that spins the right way, or else it will act like yours. If it didn't do it before you replaced the pump, my money's on it.

The whistle is most likely vacuum leaks as mentioned above, grab a can of carb/brake/contact cleaner and shoot away in around vacuum points and listen for a rpm change, I'm sure you'll find it.
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Unread 05-26-2012, 12:44 PM   #14
MLJeeper
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Originally Posted by SDGBASSE View Post
The whistle is most likely vacuum leaks as mentioned above, grab a can of carb/brake/contact cleaner and shoot away in around vacuum points and listen for a rpm change, I'm sure you'll find it.
Just remember to do this when the engine is relatively cool. If you spray that on a hot exhaust manifold, it will flash. Probably wont hurt you, but will make you need a change of pants.
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Your limited slip differential sucks.

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Any video of the sound?
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Unread 05-26-2012, 12:51 PM   #15
SDGBASSE
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Lol good point. ^^^^
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