Engine fan - Revision history

Pokseva: refactored; added instructions on fan removal

2025-08-21T10:39:13Z

refactored; added instructions on fan removal

Pokseva: Pokseva moved page WIS 20.40 Fan, Fan Clutch to Engine fan

2024-02-19T08:23:52Z

Pokseva moved page WIS 20.40 Fan, Fan Clutch to Engine fan

← Older revision	Revision as of 08:23, 19 February 2024
(No difference)

Pokseva: /* DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan) */ added photos, part numbers, wiring, video of removal and motor swap

2024-02-15T19:53:15Z

DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan): added photos, part numbers, wiring, video of removal and motor swap

@@ Line 33: / Line 33: @@
 Most enthusiasts replace a failed Engine Electric Suction Fan (Cooling Fan) with a complete new unit but on later models with inbuilt Fan Control Module it is possible to just replace the fan motor and controller with consequent savings on cost and shipping. Check eBay for suppliers of fan motors.
-==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==
+== Parts ==
-===DIY How To Replace Engine/Radiator Fan===
+S500/S450/S350:
 {|
 |{{#ev:youtube|https://youtu.be/XGsTMF4OTT8|320|left|Replace Engine Fan (By Masood)|frame}}
 |}

Masood: /* DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan) */

2020-04-21T22:51:11Z

DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)

← Older revision		Revision as of 22:51, 21 April 2020
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	==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==		==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==
	The Diagnosis and repair was done on a W204 but is relevant to other M-B models.
			===DIY How To Replace Engine/Radiator Fan===

			This video shows in detail how to replace the Cooling Fan on your W220 (S500/S430).
			{\|
			\|{{#ev:youtube\|https://youtu.be/XGsTMF4OTT8\|320\|left\|Replace Engine Fan (By Masood)\|frame}}
			\|}

			The following Diagnosis and repair was done on a W204 but is relevant to other M-B models:

	http://www.benzworld.org/forums/w204-c63-amg/2023625-w204-2008-electric-fan-fault-diagnosis.html#post8900649		http://www.benzworld.org/forums/w204-c63-amg/2023625-w204-2008-electric-fan-fault-diagnosis.html#post8900649

Ricebubbles: Added link Back to Index

2016-03-28T05:08:47Z

Added link Back to Index

← Older revision		Revision as of 05:08, 28 March 2016
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			Back to '''[[Index]]'''

	==Description - Engine Electric Suction Fan (Cooling Fan)==		==Description - Engine Electric Suction Fan (Cooling Fan)==
	In STAR DAS and WIS, the Engine Electric Suction Fan (Cooling Fan) is referred to as “combustion engine and air conditioning with integrated control fan motor” and is designated M4/7.		In STAR DAS and WIS, the Engine Electric Suction Fan (Cooling Fan) is referred to as “combustion engine and air conditioning with integrated control fan motor” and is designated M4/7.

Ricebubbles: Added section Description - Engine Electric Suction Fan (Cooling Fan)

2015-11-18T11:54:32Z

Added section Description - Engine Electric Suction Fan (Cooling Fan)

← Older revision		Revision as of 11:54, 18 November 2015
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			==Description - Engine Electric Suction Fan (Cooling Fan)==
			In STAR DAS and WIS, the Engine Electric Suction Fan (Cooling Fan) is referred to as “combustion engine and air conditioning with integrated control fan motor” and is designated M4/7.

			[[File:M4 7 Engine Electric Suction Fan.png\|500px\|center]]

			The Electric Fan (M4/7) is about 600W which means that large currents are required for it to operate. The fan motor receives command pulses from the Fan Control Unit. In early vehicles the Fan Control Unit was a separate part and mounted on the fan shroud. On later models the Fan Control Unit was built in to the fan motor.

			Each type of Fan Control Unit employs PWM which stands for Pulse Width Modulation and refers to the very efficient method for controlling the fan motor speed. The voltage applied to the fan motor is "chopped" between 0V and 12V with the resulting fan speed being determined by the degree of "chopping".

			===Typical PWM Control Signals===
			These diagrams were obtained by observing Cathode Ray Oscilloscope (CRO) measurements of typical control signals and the Suction Fan voltages.

			10% or zero RPM condition.
			[[File:Suction Fan Control Signal Pulses at 10% PWM.png\|600px\|center]]

			90% or full speed RPM condition.
			[[File:Suction Fan Control Signal Pulses at 90% PWM.png\|600px\|center]]

			The control signals from the Fan Control Unit match the above diagrams except that the amplitude of the signals is about 3Vp-p instead of 12Vp-p.

			==Issues - Engine Electric Suction Fan (Cooling Fan)==
			A common cause of no fan rotation is a failed Fan Control Module, either external or inbuilt. The large currents can stress electronic components and the car is a hostile environment with vibration, heat, and moisture all present in large quantities. A weak component or electrical connection can also produce a large amount of heat due to the very high currents being controlled, thus leading to complete failure.

			Suction Fan Motor A204 540 07 88 with cover removed.
			[[File:Suction Fan Motor A204 540 07 88 with cover removed.png\|500px\|center]]

			Burnt solder joint in Suction Fan Motor.
			[[File:Suction Fan Motor A204 540 07 88 showing burnt solder joint.png\|500px\|center]]

			==Repair - Engine Electric Suction Fan (Cooling Fan)==
			Most enthusiasts replace a failed Engine Electric Suction Fan (Cooling Fan) with a complete new unit but on later models with inbuilt Fan Control Module it is possible to just replace the fan motor and controller with consequent savings on cost and shipping. Check eBay for suppliers of fan motors.

	==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==		==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==
	The Diagnosis and repair was done on a W204 but is relevant to other M-B models.		The Diagnosis and repair was done on a W204 but is relevant to other M-B models.

Ricebubbles: Added section DIY Diagnosis and Replace.

2015-03-15T14:51:23Z

Added section DIY Diagnosis and Replace.

← Older revision		Revision as of 14:51, 15 March 2015
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			==DIY Diagnosis and Replace - Engine Electric Suction Fan (Cooling Fan)==
			The Diagnosis and repair was done on a W204 but is relevant to other M-B models.

			http://www.benzworld.org/forums/w204-c63-amg/2023625-w204-2008-electric-fan-fault-diagnosis.html#post8900649

	==Adjust Threshold Temperature - Engine Electric Suction Fan (Cooling Fan)==		==Adjust Threshold Temperature - Engine Electric Suction Fan (Cooling Fan)==

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	In the process I discovered a fabulous tool for wirelessly logging data from my car to my Smart Phone and Desktop Computer. Refer to: [[Code Readers]]		In the process I discovered a fabulous tool for wirelessly logging data from my car to my Smart Phone and Desktop Computer. Refer to: [[Code Readers]]

	~~===~~Acknowledgement - Engine Electric Suction Fan (Cooling Fan)~~===~~		'''Acknowledgement - Engine Electric Suction Fan (Cooling Fan)'''

	This DIY document was based on posts by MBWorld member ‘aleksandar1099’, ‘Jakpro1’, and ‘vrus’ and BenzWorld members ‘Saeed Amini’, ‘wallyp’, ‘jnash’ and 'Ex-Fed'.		This DIY document was based on posts by MBWorld member ‘aleksandar1099’, ‘Jakpro1’, and ‘vrus’ and BenzWorld members ‘Saeed Amini’, ‘wallyp’, ‘jnash’ and 'Ex-Fed'.

	~~===Reference - Engine Electric Suction Fan (Cooling Fan)===~~		Refer to BenzWorld Thread and DIY pdf attachment at Post #49:
	~~Link~~ to BenzWorld Thread and DIY pdf attachment at Post #49:

	http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis-5.html		http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis-5.html

Ricebubbles at 11:11, 13 March 2015

2015-03-13T11:11:58Z

← Older revision		Revision as of 11:11, 13 March 2015
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	~~'''~~Engine Electric Suction Fan (Cooling Fan) ~~Threshold Temperature'''~~		==Adjust Threshold Temperature - Engine Electric Suction Fan (Cooling Fan)==

	~~Acknowledgement~~

	~~This DIY document was based on posts by MBWorld member ‘aleksandar1099’, ‘Jakpro1’, and ‘vrus’ and BenzWorld members ‘Saeed Amini’, ‘wallyp’, ‘jnash’ and 'Ex-Fed'~~

			===Summary - Engine Electric Suction Fan (Cooling Fan)===
	This DIY document refers to both W211 and W220 models and may be relevant to other Mercedes-Benz models.		This DIY document refers to both W211 and W220 models and may be relevant to other Mercedes-Benz models.

	STAR DAS can be used to adjust the “Correction programming of the electric suction fan for engine or air conditioning”. “The correction is used for shifting the engine temperature dependence of the electric suction fan for engine or air conditioning”. That is adjust the Engine Electric Suction Fan (Cooling Fan) Threshold Temperature.		STAR DAS can be used to adjust the “Correction programming of the electric suction fan for engine or air conditioning”. “The correction is used for shifting the engine temperature dependence of the electric suction fan for engine or air conditioning”. That is adjust the Engine Electric Suction Fan (Cooling Fan) Threshold Temperature.

	~~Summary~~

	By changing the temperature at which the cooling fan on my 2003 W220 S500L comes on to a lower value, I have improved the performance of the car’s air conditioning on hot days. The air coming from the cabin vents now feels sharp (cold) even when the car is idling at traffic lights. Before the adjustment, the cabin became noticeably and uncomfortably warmer after idling for a few minutes.		By changing the temperature at which the cooling fan on my 2003 W220 S500L comes on to a lower value, I have improved the performance of the car’s air conditioning on hot days. The air coming from the cabin vents now feels sharp (cold) even when the car is idling at traffic lights. Before the adjustment, the cabin became noticeably and uncomfortably warmer after idling for a few minutes.

	Note my air conditioner is permanently left on at 22°C or 23°C in automatic mode. In my opinion the ACC now works as M-B intended, that is completely effectively, even in extremely hot climates, and quite unobtrusively, befitting the performance and elegance of an ‘S’ Class.		Note my air conditioner is permanently left on at 22°C or 23°C in automatic mode.

	~~In the process I discovered a fabulous tool for wirelessly logging data from my car to my Smart Phone and Desktop Computer~~.

			===Result - Engine Electric Suction Fan (Cooling Fan)===
	Detailed Engine Coolant Temperature versus time graphs (before and after adjusting the Temperature Correction Value) are shown.		Detailed Engine Coolant Temperature versus time graphs (before and after adjusting the Temperature Correction Value) are shown.

	Sample of data results: A Temperature Correction Value of 0°C (M-B Factory Setting) means the Engine Cooling Fan switches on at 97°C and off at 92°C. This can clearly be seen in the sample graph.		Sample of data results: A Temperature Correction Value of 0°C (M-B Factory Setting) means the Engine Cooling Fan switches on at 97°C and off at 92°C. This can clearly be seen in the sample graph.

	~~http~~:~~//w220.ee/images/b/b7/~~Engine_Coolant_Temperature_with_0C_Threshold_Correction_Value.JPG		[[File:Engine_Coolant_Temperature_with_0C_Threshold_Correction_Value.JPG\|700px\|center]]

			In my opinion the ACC now works as M-B intended, that is completely effectively, even in extremely hot climates, and quite unobtrusively, befitting the performance and elegance of an ‘S’ Class.

			In the process I discovered a fabulous tool for wirelessly logging data from my car to my Smart Phone and Desktop Computer. Refer to: [[Code Readers]]

			===Acknowledgement - Engine Electric Suction Fan (Cooling Fan)===
			This DIY document was based on posts by MBWorld member ‘aleksandar1099’, ‘Jakpro1’, and ‘vrus’ and BenzWorld members ‘Saeed Amini’, ‘wallyp’, ‘jnash’ and 'Ex-Fed'.

			===Reference - Engine Electric Suction Fan (Cooling Fan)===
	Link to BenzWorld Thread and DIY pdf attachment at Post #49:		Link to BenzWorld Thread and DIY pdf attachment at Post #49:

	http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis-5.html		http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis-5.html

Ricebubbles: Corrected link to BenzWorld to show Post #49.

2015-03-05T04:37:36Z

Corrected link to BenzWorld to show Post #49.

← Older revision		Revision as of 04:37, 5 March 2015
Line 23:		Line 23:
	http://w220.ee/images/b/b7/Engine_Coolant_Temperature_with_0C_Threshold_Correction_Value.JPG		http://w220.ee/images/b/b7/Engine_Coolant_Temperature_with_0C_Threshold_Correction_Value.JPG

	Link to BenzWorld Thread and DIY pdf attachment:		Link to BenzWorld Thread and DIY pdf attachment at Post #49:

	http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis.html		http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis-5.html

Ricebubbles: Added detail for Engine Electric Suction Fan (Cooling Fan) Threshold Temperature Adjustment

2015-03-04T10:02:02Z

Added detail for Engine Electric Suction Fan (Cooling Fan) Threshold Temperature Adjustment

New page

'''Engine Electric Suction Fan (Cooling Fan) Threshold Temperature'''

Acknowledgement

This DIY document was based on posts by MBWorld member ‘aleksandar1099’, ‘Jakpro1’, and ‘vrus’ and BenzWorld members ‘Saeed Amini’, ‘wallyp’, ‘jnash’ and 'Ex-Fed'

This DIY document refers to both W211 and W220 models and may be relevant to other Mercedes-Benz models.

STAR DAS can be used to adjust the “Correction programming of the electric suction fan for engine or air conditioning”. “The correction is used for shifting the engine temperature dependence of the electric suction fan for engine or air conditioning”. That is adjust the Engine Electric Suction Fan (Cooling Fan) Threshold Temperature.

Summary

By changing the temperature at which the cooling fan on my 2003 W220 S500L comes on to a lower value, I have improved the performance of the car’s air conditioning on hot days. The air coming from the cabin vents now feels sharp (cold) even when the car is idling at traffic lights. Before the adjustment, the cabin became noticeably and uncomfortably warmer after idling for a few minutes.

Note my air conditioner is permanently left on at 22°C or 23°C in automatic mode. In my opinion the ACC now works as M-B intended, that is completely effectively, even in extremely hot climates, and quite unobtrusively, befitting the performance and elegance of an ‘S’ Class.

In the process I discovered a fabulous tool for wirelessly logging data from my car to my Smart Phone and Desktop Computer.

Detailed Engine Coolant Temperature versus time graphs (before and after adjusting the Temperature Correction Value) are shown.

Sample of data results: A Temperature Correction Value of 0°C (M-B Factory Setting) means the Engine Cooling Fan switches on at 97°C and off at 92°C. This can clearly be seen in the sample graph.

http://w220.ee/images/b/b7/Engine_Coolant_Temperature_with_0C_Threshold_Correction_Value.JPG

Link to BenzWorld Thread and DIY pdf attachment:

http://www.benzworld.org/forums/w220-s-class/1735481-question-about-star-diagnosis.html