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Old 11-17-2003, 07:38 PM
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Join Date: Jun 2003
Location: New Rochelle
Posts: 26
Plastic Radiator Drain Plug

I just changed the coolant/antifreeze in my 1984 300sd and while tightening the Plastic Radiator Drain Plug, the head broke off, due to the cold weather. I figure I have to drill out the the rest of the screw, but I was wondering what the radiator threads were made of, if drilling it out might damage the radiator itself. Any suuggestions?

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Old 11-17-2003, 09:58 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,574
I had a similar experience recently with an SUV.

I "carefully" drilled a small hole in the center, then used an EZ-Out to get the loosening process started. If you damage the threads, some sort of repair(depending on severity) will be required.

To me the trick here is accessibility....can you get a straight shot at it from underneath. If not, pull the radiator.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 11-17-2003, 10:40 PM
Posts: n/a
The plug at the bottom will come right out. Easiest way is to heat a SMALL slotted screwdriver red, and let it "melt" a slot in the CENTER of the blue screw. Good luck......
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Old 11-19-2003, 04:24 PM
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Join Date: Jun 2003
Location: New Rochelle
Posts: 26
Thanks for the suggestions. Someone else suggested using a much smaller diameter screw die, which on backing it out will grab the plastic.
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Old 11-20-2003, 03:08 AM
zeronero's Avatar
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Join Date: May 2003
Location: San Francisco Bay Area
Posts: 426
That same thing happened to me, but it was like 70F outside. I just released the lower radiator hose.

1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500
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