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post #1 of 6 Old 09-16-2015, 11:24 PM Thread Starter
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radiator cap?

hey eveyone,

Im having radiator blues. So my 2000 XJ is running and its not over heating at all but im having it randomly spit coolant from my radiator cap a few minutes after parking. it does not do it everytime just now and again and my lower radiator hose will be flat. not the top one though. im not going over 210 at all i just find this to be a little weird. I put a new water pump on a month ago. does a new radiator cap sound like the fix?

Thanks for help in advance

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post #2 of 6 Old 09-17-2015, 10:38 AM
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Probably. Install a 16 lbs Stant or genuine Jeep cap.

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post #3 of 6 Old 09-17-2015, 02:23 PM
Rob K
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Could be that the cap is bad. I've had bad ones right from the store. Make sure the hose going to the overflow jug is not plugged. Also there should be a coiled wire slid inside your lower radiator hose to keep it from collapsing. Sounds like yours is missing.
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post #4 of 6 Old 09-18-2015, 02:59 PM
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Yup. Time for a stant cap and a new lower radiator hose.

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post #5 of 6 Old 09-18-2015, 08:22 PM
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Recently had the same problem with my 99. Bought a new stant cap and ask is good.

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post #6 of 6 Old 09-18-2015, 08:30 PM
Rob K
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Start by replacing the radiator cap and checking the overflow hose for blockage. If lower radiator hose is still collapsing, when the engine cools and sucks coolant back into the system from the jug, then it's time to replace it. The other time it can collapse is when your running at high rpms. This is why you need a new stiff hose or one that's reinforced.

Here's an old post copied from AZ JEFF

As others pointed out, OEM hoses have the wire reinforcement, but aftermarket hoses do not. The purpose of this reinforcement is to prevent hose collapse when the water pump sucks the water back from the radiator towards the engine.

This is NOT a big deal when the aftermarket hoses are new and stiff. Once they age, heat makes them soft, and hose collapse can be an issue.

There are three ways to deal with this:
1. when replacing an OEM hose with an aftermarket one, SAVE and REUSE the wire coil insert in the new hose.
2. buy only OEM hoses from the dealer
3. buy aftermarket hoses and replace them once they begin to get soft, but before water pump suction collapses the hose when hot.
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cherokee sport , radiator , radiator cap

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