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Old 12-28-2010, 11:32 PM   #1
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Angry Coolant Spray Under Hood

Recently my TJ has been spraying coolant vertically so that its splashed on the underside of the hood. At first I though that the resevour cap was coming loose while offroading and sloshing round, but now it appears that it is shooting out of some sort of blow off valve located on the passenger side of the radiator. I replace the old stock radiator (was leaking at plastic at ottom) with an all alumminum model, but problem persists. Engine is not over heating and thermostat appears to be working properly. Any suggestions?

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Old 12-29-2010, 12:00 AM   #2
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The only "blow off valve" the radiator has is the radiator cap. There is a drain valve on the bottom of the radiator on the passenger side, is that what you mean? If it's leaking, try opening the valve partially when the engine is cold then tightly shutting it. Perhaps the valve wasn't seating properly and if that's the case, this might stop the leak.

The most common point for the TJ's radiator to leak is at the top and bottom seams where the plastic top and bottom caps are crimped to the core. When one of the seams starts leaking it's time to replace the radiator as it cannot be successfully permanently resealed like most other radiators can.

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Old 12-29-2010, 12:58 AM   #3
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sounds to me like you may have hard to see leak in one of your hoses that is spraying radiator fluid only when under pressure. If you can't see fuild on the radiator itself and its a new all alluminum then ide check hoses and water pump
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Old 12-29-2010, 01:27 AM   #4
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Hi

Are you sure it is not just you reservoir bottle that is filled with too much coolant?

I had the same problem - the coolant is sprayed from the overflow orifice at the top of the reservoir bottle on to the hood by the wind from the radiator fan..

The bottles have to be EXACTLY at the full mark - anything above will be pushed out of the reservoir bottle..

Might be?
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Old 12-29-2010, 08:10 AM   #5
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Hose Leak

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Originally Posted by Black98 View Post
sounds to me like you may have hard to see leak in one of your hoses that is spraying radiator fluid only when under pressure. If you can't see fuild on the radiator itself and its a new all alluminum then ide check hoses and water pump
This sounds like a good explanation to me. I will check hoses and see if I can find the problem.
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Old 12-29-2010, 09:14 AM   #6
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Better yet: Go to your local parts store, tell them you wanna use their pressure tester.

It goes in place of the radiator cap so either let your jeep cool or use a rag and stand back.

Pump 15 lbs of pressure and then look..... you will see where the leak is I promise. Then go from there.
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Old 12-29-2010, 11:48 AM   #7
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Originally Posted by CapnDean View Post
Better yet: Go to your local parts store, tell them you wanna use their pressure tester.

It goes in place of the radiator cap so either let your jeep cool or use a rag and stand back.

Pump 15 lbs of pressure and then look..... you will see where the leak is I promise. Then go from there.
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