So the engine coolant gauge is kinda of a Liar ?
06-09-2024 | 11:25 AM
#26
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2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
That was why I re-visited this thread Juan.
I asked them owners of W212 AMG section, the true AMG cluster, is their value also a white liar or not ?
https://mbworld.org/forums/w212-amg/...ml#post8983421
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pierrejoliat (06-09-2024)
06-09-2024 | 11:28 AM
#27
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2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Does W212 use the electric aux pump to supplement the belt driven pump at low vehicle speed? This is one of the reasons the aux pump is present. If you have an aux pump you can observe state (its voltage) with an OBD device.
Electronic indicator giving false values vs actual measurement is common, same with VAG/Porsche. It’s designed to reduce panicked phone calls to dealers and false alarms for warranty claims by customers whose vehicles are “overheating”.
Electronic indicator giving false values vs actual measurement is common, same with VAG/Porsche. It’s designed to reduce panicked phone calls to dealers and false alarms for warranty claims by customers whose vehicles are “overheating”.
Tee of mechanical coolant pump SUCTION side. It does not help cool anything engine wise.
Will be good for start stop condition in winter....
to keep driver warm
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chassis (06-09-2024),
pierrejoliat (06-09-2024)
06-09-2024 | 12:04 PM
#28
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From: MA Coast
W204 2010 C300 4matic Sport M272
Interesting information. I have a W204 with M272 engine and notice the temp hovers at 90, a very few times I remember seeing it drop down to 80 which stood out to me because I had been driving for along time and wondered how the coolant got cooler.
Im assuming it has the same feature as this. Probably keeps people like me from worrying, watching the gauge because its fluctuating constantly.
Im assuming it has the same feature as this. Probably keeps people like me from worrying, watching the gauge because its fluctuating constantly.
06-10-2024 | 12:47 PM
#29
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From: 122W, 37N
2016 E350 4Matic wagon, 2019 Ford Expedition 4x4
So some W124 did have pressure gauges. Were they true gauges?
I sold W124 over a decade ago, so the memories faded, but still remember that oil pressure gauge going to 0 at idle was hot topic on W123 section and R129 section, when I don't remember the subject discussed on W124 section. Red warning light coming on sharp turns was on other hand.
With huge variety of models and option MB makes, lot of things can exist, but what was most common?
Kind of dispute about history in times where modern engines have no oil pressure sensors at all.
I sold W124 over a decade ago, so the memories faded, but still remember that oil pressure gauge going to 0 at idle was hot topic on W123 section and R129 section, when I don't remember the subject discussed on W124 section. Red warning light coming on sharp turns was on other hand.
With huge variety of models and option MB makes, lot of things can exist, but what was most common?
Kind of dispute about history in times where modern engines have no oil pressure sensors at all.
06-13-2024 | 11:21 AM
#30
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2010 E550, 273 Engine: 2012 S550, 278 Engine
Does W212 use the electric aux pump to supplement the belt driven pump at low vehicle speed? This is one of the reasons the aux pump is present. If you have an aux pump you can observe state (its voltage) with an OBD device.
Electronic indicator giving false values vs actual measurement is common, same with VAG/Porsche. It’s designed to reduce panicked phone calls to dealers and false alarms for warranty claims by customers whose vehicles are “overheating”.
Electronic indicator giving false values vs actual measurement is common, same with VAG/Porsche. It’s designed to reduce panicked phone calls to dealers and false alarms for warranty claims by customers whose vehicles are “overheating”.
06-13-2024 | 11:45 AM
#31
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From: unbegrenzt
2017 GLE350 4MATIC
Isn't the AUX pump for the REST function that some cars have? My 2010 E550 has an electronic pump located in the left side under the hood between brake and the wind shiels washer tank. It does not do anything as I do not have the REST function, but I think this pump is for that. Another reason for it not to work is probably the warm climate I am located at, so no cabin heating needed.
WIS has a good diagram and function description per model for this pump.
If you have this pump on your car it does something. It doesn’t do nothing.
One pump function is after run. After engine shut down the pump continues to circulate coolant through the engine and radiator until the target coolant temp is achieved. This is unrelated to the REST function.
Last edited by chassis; 06-13-2024 at 11:47 AM.
06-13-2024 | 11:52 AM
#32
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2017 GLE350 4MATIC
Focus on the first sentence. M13/5 is part of the primary engine cooling system.
Per WIS GF83.40-P-2020A Circulation pump, basic function, component M13/5
- The pump is used to support the coolant pump when the engine is running. When the residual heat system mode or the heater booster function is switched on, it pumps the coolant through the engine and heater core.
- When the stationary heater is switched on, the pump feeds coolant through the engine, heater unit and heater core.
- When the pre-entry climate control is activated, the pump feeds coolant through the high voltage PTC heater and the heater core.
- ECO start/stop at "engine stop" the pump feeds coolant through the engine and heater core.
- In diesel vehicles the pump is required for turbocharger afterrun cooling function.
Per WIS GF83.40-P-2020A Circulation pump, basic function, component M13/5
- The pump is used to support the coolant pump when the engine is running. When the residual heat system mode or the heater booster function is switched on, it pumps the coolant through the engine and heater core.
- When the stationary heater is switched on, the pump feeds coolant through the engine, heater unit and heater core.
- When the pre-entry climate control is activated, the pump feeds coolant through the high voltage PTC heater and the heater core.
- ECO start/stop at "engine stop" the pump feeds coolant through the engine and heater core.
- In diesel vehicles the pump is required for turbocharger afterrun cooling function.
06-13-2024 | 12:04 PM
#33
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2017 GLE350 4MATIC
06-13-2024 | 01:00 PM
#34
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
The pump is stated on this site to have different functions on different models. Need to do some searching to find the several examples.
WIS has a good diagram and function description per model for this pump.
If you have this pump on your car it does something. It doesn’t do nothing.
One pump function is after run. After engine shut down the pump continues to circulate coolant through the engine and radiator until the target coolant temp is achieved. This is unrelated to the REST function.
WIS has a good diagram and function description per model for this pump.
If you have this pump on your car it does something. It doesn’t do nothing.
One pump function is after run. After engine shut down the pump continues to circulate coolant through the engine and radiator until the target coolant temp is achieved. This is unrelated to the REST function.
It is a good thing to circulate coolant after engine stop as engine has hot spots that can actually boil the coolant that just sits in the small bores in the engine block. Circulation keeps this from happening and keeps the coolant from overheating to a boiling point. My previous Audi Q7 had this function.
