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#1
02-17-2007, 07:24 PM
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Radiator Cap Pressure Question
My radiator cap bottom seal had split off from the cap and was permanently stuck to the radiator neck itself. So I bought a new cap from the dealer today. They only had one cap for a 240D listed but I see that it's rated 120 instead of 100 which is what the old one with the bad seal was rated as. Will this result in damage if I drive the car with the 120 cap instead of finding another 100? Although where I'd get one from I dont know if the 120 type is the only one available now. My concern is the red warning lable saying "use only cover with labeled 100" that's stuck to the fan shroud.
- Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021  2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S 
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#2
02-17-2007, 07:52 PM
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According to Fastlane the 1.2 bar cap has been superseded by the 1.4 bar cap so I imagine the warning is irrelevant. Fastlane still sells 1.2 bar caps. $8 plus shipping.
I don't know if 100 = 1.2 bar but an on-line store that lists MB part numbers says the original 123 501 02 15 is rated at 1.2 bar. Sixto 93 300SD 3.0 Last edited by sixto; 02-17-2007 at 08:25 PM.
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#3
02-17-2007, 08:13 PM
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Latest cap = 1.4bar.
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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ] "A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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#4
02-17-2007, 09:25 PM
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There will be no damage from running a 100, 120 OR 140 mbar cap. The only reason MB does not produce the 100 or 120 any more is because later models use the 140. Since they can be exchanged, it's cheaper to produce 1 common item instead of 3.
Running the cooling system at 20.3psi instead of 14.5psi will also help it stay cooler for longer by raising the fluids boiling point.
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#5
02-17-2007, 11:28 PM
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Thanks for the info. The original cap I replaced which was rated as 100, had a part number of 123 501 00 15. I guess if Mercedes is happy with the updated cap 123 501 02 15 at 120, then I'll stick with that.
- Peter.
__________________
2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S
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