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Old 08-23-2011, 06:40 PM
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Join Date: Jan 2009
Location: Napa Ca
Posts: 75
300sel radiator question

On my 1989 300sel I have the overflow vent line on top of the radiator that has a plug with o-ring that fits on top. It is leaking/seeping...

why is it not a one piece...can I glue it on? it did pop off a couple of years ago. Afraid it might do so again

Anyone having had to deal with this, please let me know

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Old 08-23-2011, 07:43 PM
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Join Date: Jan 2003
Location: Dallas
Posts: 777
I suppose they made it flexible and replaceable because it seems to be in such a damage-prone location. The part only costs about $4. I can see where if it were forcefully pulled out that reseating properly might be a problem. the appropriate way to remove it is to get to the backside thru the radiator hose opening and slide a 10mm box wrench over the tangs, then pull up lightly. if it was yanked out, the flange on the radiator side tank may have been damaged, so even a new one might leak or pop out. In that case, only recourse would be a new side tank, or trying to epoxy it in (not a good approach I don't think.). I'd try a new one and see how it went in and if it felt secure before I tried glue.

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