P0128 Mercedes-Benz GLC300 X253 2019 M274. Thermostat Replacement. Thermostat Assembly Housing.

Here is a video of showing the replacement of the Thermostat Assembly on a 2019 Mercedes-Benz GLC300, this should also apply to some other 4 cylinder Mercedes models from same years.
P0128 Mercedes-Benz GLC300 X253 2019 M274. Thermostat Replacement. Thermostat Assembly Housing.
The coolant temperature is below the coolant thermostat specified temperature.
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[@baltika1]

Good job👍

[@JoseRodriguez-iw2dy]

Great video! Do you have to disconnect the battery to do this job?

[@DEEuroworks]

@@JoseRodriguez-iw2dy Thank you, you don’t, good idea to clear the codes after you are done.

[@justinmijnbuis]

I thought BMW was quite bad but man the stuff you have to remove to get to a thermostat housing on this Merc is insane.

[@DEEuroworks]

@@justinmijnbuis Yes, it’s a pretty involved job.

[@sjohnson7735]

Great video, Would have been nice to replace the crank case vent valve that commonly fails while you were in there.

[@DEEuroworks]

@@sjohnson7735 Thank you for watching. Will keep that in mind for the future.

[@sjohnson7735]

@@DEEuroworks Just subbed. You are very thorough and detailed oriented. Very enjoyable watching. Would love to know the miles on the cars you are working on to gauge when these failures happen.

[@DEEuroworks]

@@sjohnson7735appreciate it, I am trying to make the videos better and more watchable, easier said than done :). This example had 93k miles. Thanks for the sub.

[@arielstereo5484]

I got a check engine light and code reads p0128. Is it for sure the coolant thermostat? Great work by the way.

[@DEEuroworks]

Most likely, thank you.

[@arielstereo5484]

Is there a part that could be replaced while my mechanic is doing this work, considering it is already torn apart? This avoids having to go in much sooner for something else.

[@DEEuroworks]

@@arielstereo5484 don’t believe so unless your car needs something to else in that area, typically not.

[@twocross]

An FYI for you is that MANN makes the oil filters for Mercedes. Amazon has them for $13 instead of the $30ish from dealer. My 2018 E300 uses HU711/6z. Exact same as filter from dealer.

[@DEEuroworks]

@@twocross true, however $30 is your typical retail price that most people pay.

[@JoseRodriguez-iw2dy]

How much coolant did you need?

[@DEEuroworks]

@@JoseRodriguez-iw2dy about 2 gallons? Don’t remember exactly

[@herbneq]

What’s the cost to repair something like this from Mercedes

[@DEEuroworks]

Around $2k I believe.

[@windows_down]

Hey man. Do you have experience on the m117 engine? I have new euro cams to install in my US model, sourced from Caribou Engineerinf and direct drop in with new rockers and setting hydraulic preload properly required during install. In your wheelhouse or nah?

[@DEEuroworks]

Don’t typically do older engines sorry.

[@windows_down]

@@DEEuroworks no worries thanks for the reply

[@carpediem4413]

This is crazy how much BS you have to go through for what should be a simple repair… makes me not want to buy a Mercedes. Yikes!

[@DEEuroworks]

@@carpediem4413 yes it is a pretty involved job.