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Old 05-11-2022, 04:47 PM   #1
Rj 2000 LS2
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2000 L-Series 3.0L Sedan
Default Passenger size floor matt is full of Dex Cool

I have had this issue once before and it vanished for a long time. Over the winter, somehow, the Saturn was leaking coolant and the light came on to add coolant. I added 2 inches of Dex Cool to stop the light indicator. I saw the passenger side floor mat had the Dex cool color and it felt wet in the center, but no real path or track of "leak".

This morning, I removed the plastic side cover to expose the heater core and connecting pipes. I drove the car for several miles and then inspected the heater core and connections to the pipes. I put paper towels beneath the heater core and the pipe connections. I felt nor saw any dex cool on these items to signal where the leak is coming from. I even wiggled them and no leak were found.

Is it possible to have cold leak vs a hot leak? It seemed to only leak while the car was sitting and not being used. Is it haunted? There is no identifiable source of the leak. The mat appears to only have antifreeze pooling in the middle of the mat and nothing around the center counsel.

Any ideas? I could simply buy a heater core with attached pipes and install that, but I would really like to isolate the problem rather than shot gunning parts.
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Old 05-17-2022, 08:46 AM   #2
Rj 2000 LS2
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Default Re: Passenger size floor matt is full of Dex Cool

I placed two paper towels beneath the heater core another under the pipe connections. I left them there for 3 days. I found drips beneath the pipe connections and none under the heater core. I suspect the O-ring is leaking. Are the O-rings a standard size or are they special? Has anyone ever disassembled the plastic pipe connection and replaced the O-rings?
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Old 05-18-2022, 03:04 PM   #3
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Default Re: Passenger size floor matt is full of Dex Cool

I have but don't recall but I don't recall replacing the o-ring and you should be able to get them from the local shop or if you replace the heater core I think they have replacement o-rings for them as well. But check to be sure your heater core isn't plugged or in need of replacement as well.
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Old 05-19-2022, 09:44 AM   #4
Rj 2000 LS2
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Default Re: Passenger size floor matt is full of Dex Cool

I'll flush the heater core when I replace the O-rings. However, when it comes to heat, the Saturn heats better and faster than our other two vehicles (Dodge Ram 2500, and an 2000 Yaris Hach Back).

Would a standard O-ring from an O-ring kit fit the heat pipe?

Does anyone know the specs on the O-rings?

I can find the O-rings from many sites. They cost $11-$16 each.

I haven't found any where to purchase new heat pipe retainer clips. I am so hard on plastic. I worry I'll break them when I take the off.
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Old 05-19-2022, 11:30 PM   #5
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Default Re: Passenger size floor matt is full of Dex Cool

Quote:
Originally Posted by Rj 2000 LS2 View Post
... I can find the O-rings from many sites. They cost $11-$16 each.

I haven't found any where to purchase new heat pipe retainer clips. I am so hard on plastic. I worry I'll break them when I take the off.
In your last sentence you stated your concern with breaking plastic parts, and I have been hard on plastic parts, too. Additionally, the plastic parts have aged and may be more brittle as a result. In that case I'd be inclined to purchase a replacement heater core which also included the seals and plastic retainers as well, and such are available. This could mean a better use of one's time knowing all parts can be replaced and there would be no worry over a broken part.
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