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Old 04-19-2015, 10:09 PM
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Radiator Drain Plug

I have a 2004 Grand Cherokee 4.7 HO with 80k miles. I recently had the water pump replaced and now the radiator drain plug is leaking. It had not been opened for about 12 years as I changed the coolant by removing hoses. I had a shop change the water pump and they drained the system by opening the drain plug. I've tried to remove the factory plug but has a keeper system to retain the plug. I'm sure the "o" ring has failed after being in place for so many years.

Is it possible to break the keeper and remove the plug to change the "o" ring? I hate to replace the radiator for a failed drain plug. Any ideas?

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Old 04-20-2015, 12:02 AM
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Re: Radiator Drain Plug

I donīt remember that i had some kind of a keeper on my old radiator drain plug. Now my jeep is made in Austria, so could have a different radiator/drain plug then yours.
If it will not be possible to remove the plug, is it maybe possible to put a rubber plug in the drain opening?
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Old 05-03-2015, 06:25 PM
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Re: Radiator Drain Plug

Thanks for your comment. I pulled the radiator, tough job, and there is a hairline crack in the plastic tank just above the drain plug area. Just enough leakage to cause a mess on the garage floor. It was losing about a 1/4 cup of coolant a week. But, with the Nevada summer heat coming I need all the cooling I can get. It's a lot easier installing radiator than removing it. Removing the hydraulic cooling fan assembly is the difficult part. Once that is out of the way, the whole assembly opens up and it is easy to work on.
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Old 05-03-2015, 07:14 PM
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Re: Radiator Drain Plug

You can remove the radiator together with the hydraulic cooling fan assy and separate them easily on the floor.
Those plastic tanks are known to crack after many years of use.
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Old 05-10-2015, 02:15 PM
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Re: Radiator Drain Plug

I was concerned about replacing the lost transmission fluid from the cooler in the radiator. I couldn't measure any loss with the transmission dipstick so thought I would measure the capacity in the old OEM radiator: 100 ml or just over 3 fluid oz. Thanks for your comments.
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