Small hose coolant leak

MERCYFULFATE000

MEMBER
2000 JEEP GRAND CHEROKEE
0.6L
V6
2WD
AUTOMATIC
230,884 MILES

Correction: my car has a 4.0l 6 cylinder.

Hello, I recently replaced my radiator cap because it was leaking coolant. So it has been working great for the past week or so. Just yesterday when I started up the car I noticed coolant was leaking. So I checked the radiator cap it was fine, but I saw the leak on the side of the radiator at the base of the small hose that connects to it. It was bubbling and leaking coolant at the base of this hose that connects to the radiator. So as pressure is rising and the car is running is when it starts to bubble and leak at the base of the hose. How can I fix this? I attached a picture you can see the wet green coolant leak.

Image (Click to make bigger)

4 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Hi,

This is the overflow hose that only gets coolant through it if the pressure is building and pushing coolant from the radiator to the overflow bottle.

I would want to find out why the pressure is building to the point it is pushing coolant out of the radiator. I would check for compression gases in the engine in order to see if the head gasket is adding pressure to the system.

This line is not meant to hold a lot of pressure. However, I would first remove it and make sure it is not split. If it is, you can just cut it back far enough to cut out the split as long as there is enough slack in the line. If not, you just need the same size rubber line that you can get from any parts store.

Let me know what you find with the line. If it checks out then I would check the head gasket before you go much further because that could explain why the last cap was leaking as well.

https://www.2carpros.com/articles/head-gasket-blown-test

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Sunday, August 18th, 2019 AT 11:41 AM

MERCYFULFATE000

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3 POSTS

Thanks. I will look into this and get back with you.

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Sunday, August 18th, 2019 AT 11:50 AM

MERCYFULFATE000

MEMBER
3 POSTS

One more thing to mention, I don't know if this has anything to do with this, but about 3 weeks ago my car had a the check engine light on. So I checked it with the car scanner and it read this code: P0306: Misfire Detected (Cylinder 6). I do plan to go get this checked out, the check engine light isn't there anymore but it will probably pop up again soon, I just recently got it smogged and the car did pass. Would this have anything to do with the radiator/overflow hose?

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Sunday, August 18th, 2019 AT 12:13 PM

KASEKENNY

MECHANIC
18,907 POSTS

Not if the engine is running fine and the misfire went away. Basically, the computer counts misfires as they happen and if it turns the light on then they stop it will hold the light on for a certain number of drive cycles before it turns the light back off. Basically, it is trying to avoid the light turning on and off, on and off.

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Sunday, August 18th, 2019 AT 5:01 PM