ACC and HVAC - Revision history

Pokseva: Pokseva moved page WIS 83.40 Automatic Climate Control (ACC) or Heating Ventilation and Air Conditioning (HVAC) to ACC and HVAC

2026-05-30T11:23:47Z

Pokseva moved page WIS 83.40 Automatic Climate Control (ACC) or Heating Ventilation and Air Conditioning (HVAC) to ACC and HVAC

← Older revision	Revision as of 11:23, 30 May 2026
(No difference)

W220.ee: /* Test Results - R134A Refrigerant Temperature Sensor (B12/1) */

2021-07-20T14:31:19Z

Test Results - R134A Refrigerant Temperature Sensor (B12/1)

← Older revision		Revision as of 14:31, 20 July 2021
Line 385:		Line 385:

	Sensitivity of sensor seems OK.		Sensitivity of sensor seems OK.

			=Resistance Specification - In Cabin Air Temperature Sensor (N22/b1)=
			The resistance specification for the In Cabin Air Temperature Sensor (N22/b1) is presumed to be the same as [[In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70)]].

W220.ee: /* Test Results - Outside Temperature Sensor (B14) */

2021-07-20T14:24:41Z

Test Results - Outside Temperature Sensor (B14)

← Older revision		Revision as of 14:24, 20 July 2021
Line 369:		Line 369:
	'''Conclusion:'''		'''Conclusion:'''
	Sensitivity of sensor seems OK.		Sensitivity of sensor seems OK.

			=R134A Refrigerant Temperature Sensor (B12/1)=

			==Testing - R134A Refrigerant Temperature Sensor (B12/1)==

			Monitor Diagnostic Parameter NR.08: and apply direct heat using an hair drier to the R134A Refrigerant Temperature Sensor B12/1 (located on top of the air conditioner receiver drier at the front left corner of the engine compartment).

			[[File:W220_2003_ACC_R134A_Refrigerant_Temperature_Sensor_%28B12_1%29.JPG\|300px\|center]]

			==Test Results - R134A Refrigerant Temperature Sensor (B12/1)==

			Start temperature: 23.5ºC which increased to 30.5ºC very slowly due to the mass of metal to be heated.

			'''Conclusion:'''

			Sensitivity of sensor seems OK.

W220.ee: /* Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing */

2021-07-20T14:18:57Z

Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing

← Older revision		Revision as of 14:18, 20 July 2021
Line 350:		Line 350:
	Start value: 116 which reduced to 114.		Start value: 116 which reduced to 114.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.
			=Outside Temperature Sensor (B14)=
			==Testing - Outside Temperature Sensor (B14)==
			* Monitor Diagnostic Parameter NR.02: using the ACC Pushbutton Control Module (N22).
			* Apply direct heat using an hair drier to the Outside Temperature Sensor B14 located in the small left front air scoop below the front bumper).

			[[File:W220_2003_ACC_Outside_Temperature_Sensor_%28B14%29.JPG\|300px\|center]]


			{\|
			\|[[File:W220_temperature_sensor_inside_bumper.jpg\|thumb\|none\|Outside temperature sensor (B14).]]
			\|[[File:W220_temperature_sensor_removed.jpg\|thumb\|none\|Sensor unplugged.]]
			\|[[File:W220_temperature_sensor_bumper_hole.jpg\|thumb\|none\|Sensor hole in the left bumper grille ([[facelift]]).]]
			\|}

			==Test Results - Outside Temperature Sensor (B14)==
			Start temperature: 24.7 ºC which quickly increased to 50.5ºC and then slowly returned to 33.7ºC after the heat was removed. (Note there was no air flow over the Outside Temperature Sensor B14 as the car was stationary.)

			'''Conclusion:'''
			Sensitivity of sensor seems OK.

W220.ee: /* Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing */

2021-07-20T14:17:00Z

Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing

← Older revision		Revision as of 14:17, 20 July 2021
Line 341:		Line 341:
	(RH Drive W220) adjacent to the fresh air intake.		(RH Drive W220) adjacent to the fresh air intake.
	http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG		http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG
			==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
			Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
			Start value: 116 which reduced to 114.
			Conclusion: Result is inconclusive.

	==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==		==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
	Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.		Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
	Start value: 116 which reduced to 114.		Start value: 116 which reduced to 114.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.

W220.ee: /* Multi-function Sensor (B31/1) Location and Access */

2021-07-20T14:16:29Z

Multi-function Sensor (B31/1) Location and Access

← Older revision		Revision as of 14:16, 20 July 2021
Line 341:		Line 341:
	(RH Drive W220) adjacent to the fresh air intake.		(RH Drive W220) adjacent to the fresh air intake.
	http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG		http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG
			==Multi-function Sensor (B31/1) NOx Nitrogen Oxide Access and Testing==
			Monitor Diagnostic Parameter NR.17: and breathe heavily on both sensors.
			Start value: 116 which reduced to 114.
			Conclusion: Result is inconclusive.

W220.ee: /* Multi-function Sensor (B31/1) Dew Point Temperature Access and Testing */

2021-07-20T14:15:58Z

Multi-function Sensor (B31/1) Dew Point Temperature Access and Testing

← Older revision		Revision as of 14:15, 20 July 2021
Line 337:		Line 337:
	Start value: 15.5 ºC which increased to 20.5 ºC.		Start value: 15.5 ºC which increased to 20.5 ºC.
	Conclusion: Sensitivity of sensor seems OK.		Conclusion: Sensitivity of sensor seems OK.
			==Multi-function Sensor (B31/1) Location and Access==
			Remove two screws and gently withdraw the Multi-function Sensor (B31/1) located at right rear corner of engine compartment
			(RH Drive W220) adjacent to the fresh air intake.
			http://w220.ee/images/4/41/W220_2003_ACC_Multi-function_Sensor_%28B31_1%29_Location_and_Access.JPG

W220.ee: /* Multi-function Sensor (B31/1) CO Carbon Monoxide Access and Testing */

2021-07-20T14:15:28Z

Multi-function Sensor (B31/1) CO Carbon Monoxide Access and Testing

← Older revision		Revision as of 14:15, 20 July 2021
Line 332:		Line 332:
	Start value: 683 which reduced to 681.		Start value: 683 which reduced to 681.
	Conclusion: Result is inconclusive.		Conclusion: Result is inconclusive.

			==Multi-function Sensor (B31/1) Dew Point Temperature Access and Testing==
			Monitor Diagnostic Parameter NR.18: and breathe heavily on both sensors.
			Start value: 15.5 ºC which increased to 20.5 ºC.
			Conclusion: Sensitivity of sensor seems OK.

W220.ee: /* In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70) Testing */

2021-07-20T14:14:53Z

In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70) Testing

← Older revision		Revision as of 14:14, 20 July 2021
Line 326:		Line 326:

	http://www.benzworld.org/forums/w220-s-class/1460424-need-help-c-diag-new-post.html		http://www.benzworld.org/forums/w220-s-class/1460424-need-help-c-diag-new-post.html


			==Multi-function Sensor (B31/1) CO Carbon Monoxide Access and Testing==
			Monitor Diagnostic Parameter NR.16: and breathe heavily on both sensors.
			Start value: 683 which reduced to 681.
			Conclusion: Result is inconclusive.

W220.ee: /* In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70) Testing */

2021-07-20T14:06:49Z

In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70) Testing

← Older revision		Revision as of 14:06, 20 July 2021
Line 314:		Line 314:
	'''Conclusion:'''		'''Conclusion:'''
	Strong adherence noted hence excellent Aspirator Motor Function.		Strong adherence noted hence excellent Aspirator Motor Function.

			'''In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Pushbutton Control Module (N22) and in Overhead Control Panel (OCP) (N70) Resistance Specification'''
			Thermistor from ebay, 10 x 10K OHM NTC Thermistor 5mm - USA Seller - Free Shipping
			Specification
			* B Constant 4050K
			* Temperature -30°C to +125°C
			* Thermistor Type NTC Thermistor
			* Tolerance ±5%
			This part is much larger than the original thermistor, but it works like a charm. The BenzWorld Poster had to
			wire the new thermistor external of the fan housing and allow for slack so the plastic housing fitted properly.

			http://www.benzworld.org/forums/w220-s-class/1460424-need-help-c-diag-new-post.html