CEL on, P0128
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me: 2015 SL400 & 2015 ML400; wife: 2022 GLC Coupe; daughter: 2017 GLC SUV
CEL on, P0128
I did see a couple of threads on this (Clkboi's thread) but is it always a bad thermostat? Reading the list on Autozone's scanner tool, I thought I saw "coolant level," or was that just wishful thinking? BTW, this is for my wife's E350, not that I think it matters.....
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CLK55
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Thanks toga; anybody have any thoughts as to the timing of this, deep-freeze temps and all?
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P0128 = thermostat stuck open. It could be the cold weather, but it could be a stuck thermostat. If it takes more than a few minutes before you have heat in the cabin, then I would replace the thermostat.
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MBWorld Fanatic!
Joined: Feb 2004
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From: Milton/Westport, MA USA
me: 2015 SL400 & 2015 ML400; wife: 2022 GLC Coupe; daughter: 2017 GLC SUV
I note that my CLK runs about a line or two over 80°C, so I asked my wife to report her temp in her car, the E350 w/ CEL on: she says it never reached 80° during her 30-40 minute commute home. I guess replacing the thermostat is indicated, $106.80 on parts.com
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Yes, 85C is the target operating temperature. You can see it go as high as 100C on a very hot day, but by then, the electric fan should kick in. Some engines don't run well above 90C, so there is a setting (via SDS) to have the fan kick on at a lower temperature to help with this.
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MBWorld Fanatic!
Joined: Feb 2004
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From: Milton/Westport, MA USA
me: 2015 SL400 & 2015 ML400; wife: 2022 GLC Coupe; daughter: 2017 GLC SUV
UPDATE: the CEL went off, but running temp still (just) below 80°....do I worry, or assume it's fine?
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E350
what thermostat I have to choose for 2006 MB E350?
Manufacturer: WAHLER
Part Number: W0133-1953845
Description: Thermostat
Thermostat
Is this is wright one for this car?
Part Number: W0133-1953845
Description: Thermostat
Thermostat
Is this is wright one for this car?
Last edited by newamerican; Feb 25, 2014 at 02:17 PM.
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2012 C300 4MATIC Sport
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E350
