Check air conditioning system for leakage · ar8330s1761e · Mercedes-Benz WIS

AR83.30-S-1761E

Check air conditioning system for leakage

18.12.2019

Model	447
	with code HH4 (THERMOTRONIC automatic climate control)
Model	447
	with code HH9 (Air conditioner, automatic heater control)
Model	447
	with code HZ7 (TEMPMATIC semi-automatic air conditioning in rear)
Model	448

Modification notes

16.12.2019

Basic data reference, added

Operation step 2

 Danger	Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)	Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.Typ 447 mit Motor 780	AS00.00-Z-0035-01A
 Danger	Risk of explosion when using a forming gas with incorrect mixing ratio. Risk of suffocation due to inhalation of forming gas. Risk of injury due to bursting of high-pressure hoses.	Wear safety glasses and protective gloves. No smoking or open flames. Work in well-ventilated rooms only.	AS83.00-Z-0001-02A
 Danger	Risk of fire due to ignition of R1234yf refrigerant on hot components. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with escaped R1234yf refrigerant and when working on pressurized parts. Risk of explosion due to formation of ignitable refrigerant/air mixtures	Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.	AS83.00-Z-0007-01A
 Warning	Risk of poisoning caused by inhaling overheated refrigerant vapors from an air conditioning system containing R134a. Risk of injury to skin and eyes caused by contact with liquid R134a refrigerant and when working on pressurized parts	Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.	AS83.00-Z-0006-01A
Topical note	General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment	Typ 447 mit Motor 780	AH00.00-Z-0300-01A
Topical note	Procedure for a damaged or leaky air conditioning system		AH83.30-N-0004-01A
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Check
1	Evacuate air conditioning system.	Model 447 except code HX1 (Refrigerant R-1234yf), Model 448	AR83.30-S-1760E
		Model 447 with code HX1 (R-1234yf refrigerant)	AR83.30-S-1760EF
2	Fill refrigerant circuit with forming gas and check for pressure drop.
	000 588 19 21 00 Leak tester		WS83.00-P-0035B
		 Temperature changes during the pressure test (e.g. through change in weather or cooling) can cause pressure surges. Consistent ambient conditions must therefore be strictly ensured. Otherwise, the check values will be changed.
		 Observe operating instructions for leak tester.
		 Fill refrigerant circuit with forming gas only when the engine is cold or when the axle drive module is cold.
		Model 447 with engine 780Pressure drop in refrigerant circuit filled with test gas	*BE08.50-N-1001-02F
		Model 447 with engine 274, 622, 651, 654, model 448Pressure drop in refrigerant circuit filled with test gas	*BE83.30-N-1001-04E
3	Determine leakage in refrigerant circuit using gas detection unit.	If no pressure drop was detected.
	000 588 03 21 00 Gas detector		WS47.00-P-0019B
		 Observe operating instructions for gas detection unit.
		If leaks are found,
		
		Replace affected component parts of refrigerant circuit.
4	Vent forming gas from refrigerant circuit on leak tester.
5	Fill air conditioning.	Model 447 except code HX1 (Refrigerant R-1234yf), Model 448	AR83.30-S-1760E
		Model 447 with code HX1 (R-1234yf refrigerant)	AR83.30-S-1760EF

Refrigerant circuit of cooling system

Number	Designation			Engine 780.701/702 in model 447
BE08.50-N-1001-02F	Pressure drop in refrigerant circuit filled with test gas	Test pressure	bar	15
		Test period	h	2
		Permissible ambient temperature fluctuation	°C	2
		Pressure drop	bar	0

Air conditioning

Number	Designation			Model 447, 448
BE83.30-N-1001-04E	Pressure drop in refrigerant circuit filled with test gas	Test pressure	bar	15
		Test period	h	2
		Permissible ambient temperature fluctuation	°C	2
		Pressure drop	bar	0

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