M177/M178 coolant thermostat (part 1)

[@igotaction]

That corrosion inside the housing looks identical to the problem the BMW N62 engine had with its coolant V channel cross pipe, incompatible metallurgy causing premature and excessive corrosion. How was that for expert testimony Tasos?

[@58fins]

Funny how that coolant became so acidic and started attacking the aluminum. 20 years ago, GM had an issue with Dexcool doing that to engines. Even low mileage units!

[@Antony_AMGenthusiast]

Ella re, have you changed a lot of coolant thermostat on the M177 ? Haven’t seen this problem on the UK forums

[@ImTheDud3]

Hello i need you advice my engine overheating , diagnotic tool shows thermostat 100% also try activate axilary pump one that responsible for charge air cooling clearly can see flow good and onother one make a sound but can se any action in expansion tank also when remove the return line from expansion tank nothing happens. Then i trick activate pump its drips few drops but no flow... so dont know do i need axilary pump or main pump with thermostat. No faults or P021700 thanks for advice

[@powerindustries]

Hi we have a W205 FL M177 engine, with P0128 code sometimes, car is 2019 with 90.000km. you think it is the thermostat?

[@igotaction]

Will they be able to sleeve it and not affect the coolant channels in between the cylinders? I was thinking Nikasil or some other plating then use stock low friction rings with upgraded pistons and connecting rods🤷🏻‍♂️🤷🏻‍♂️🤷🏻‍♂️

[@user-de9rg2nu5p]

Does the thermostat on the M176 suffer from the same issue?

[@interesting7906]

Mr Omar goes to mechanic school. lol

[@finallydoneAyyy]

4.4-5.4 hrs warranty 😂😂😂😂 the most over engineered piece of shit i ever worked on.

[@hrtbrk1127]

My GLC63 is the shop right now with this issue. Warranty is taking care of it. 40,000 miles. 😒

[@finallydoneAyyy]

@@hrtbrk1127 I believe you have an extension to this thermostat until 2028 or some mileage. Lucky for customers. Bad for techs