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LIM Runner Now Leaking Coolant

Old 06-07-2019, 10:48 PM
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Default LIM Runner Now Leaking Coolant

I'm on the hwy and suddenly the PK Ave is starting to overheat..eek. Pull over, shut it off & discover rad cap is cold & nothing in the the coolant reservoir.
Pop the rad cap off & luckily I had 1 gallon of coolant in trunk. Filled it up and all was good but could not find the leak, but could smell it, nothing dripping below car heater & rad hose all dry.
Next day when car cold, I got a bright inspection light and found the source,, the rubber runner from LIM, outside edge is leaking with a small crack..

The upper & lower intake gaskets were refreshed /done 4 years ago.
I have LPS cleaned and alcohol wiped compressed air the area, applied a silicone patch for now, I guess I will know more tomorrow how bad the leak still is, or not.

Mike do you know if there are any better quality runners available beside what comes with the fel pro gasket set? Kinda disappointing this one only lasted 4 years.
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Old 06-08-2019, 10:51 AM
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I don't know of any better kits.

Don't forget to check/change your oil.
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Old 06-08-2019, 12:31 PM
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I know you probably know this but make sure you didn't get glycol in the oil, Also the Fel Pro is as good as any.
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Old 06-08-2019, 01:32 PM
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Yes not to worry, Luckily I believe it is leaking outwards only it seems, and the oil appears to be fine,no smoke from tailpipe, but I will check oil condition daily now until proper repairs can be made.
With the 24 hour external silicone patch,almost fully cured, I am going to take the car for a drive and re-inpect for any leaks.
I think this was an un-noticed slow leak over time, that caught up to me..
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Old 06-08-2019, 05:19 PM
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I don't think that coolant should be in that area, and suspect the issue is something else. That should be oil only right there.
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Old 06-08-2019, 05:43 PM
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You could try a lower PSI radiator cap.
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Old 06-08-2019, 06:52 PM
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I've got a shop inspection booked for Thurs by a friend who is very familiar with these engines. I'll report back what he finds.
My silicone patch did nothing, as it is still leaking from somewhere ..but where..?? I will have to report back.
Hoping for the best/..preparing for the worst.
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Old 06-08-2019, 07:14 PM
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You'll figure it out.
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Old 06-08-2019, 10:28 PM
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Looking at it again, I would check the underside of the LIM for a leak right in that area. But, that is right where the UIM and TB can all leak too.
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Old 06-13-2019, 11:17 PM
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It turned out to be the UIM gasket weaping pretty good on the drivers side.
New Prestone coolant (long life) was used as this system was flushed a long time ago of dex cool.
New gasket installed and then pressure tested, all is good again.
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