Check evaporator for leaks - AR83.30-P-5550NKB

MODEL 117, 156, 176, 231, 242, 246 

Fig 1: Checking Evaporator For Leaks

Courtesy of MERCEDES-BENZ USA

	Risk of explosion  caused by welding or soldering work on closed air conditioning system. Risk of poisoning  caused by inhaling overheated refrigerant vapors. Risk of injury  to skin and eyes caused by contact with liquid refrigerant.	Do not 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 areas. Carry out repair work on the air conditioning system circuit only after the system has been drained.	AS83.00-Z-0001-01A
	Procedure for a damaged or leaky air conditioning system		AH83.30-N-0004-01A
	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-P-0005-01A
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Check
1	Remove expansion valve	Model 231	AR83.30-P-5520RK
		Model 117, 156, 176, 242, 246	AR83.30-P-5520NKB
2.1	Install adapter (1)	Model 117, 156, 176, 242, 246 Install adapter (1) in place of expansion valve with new sealing rings (2, 6).
		Bolt on expansion valve	*BA83.30-P-1001-01G
		Adapter	Fig 3
2.2	Install adapter (1) and adapter hose	Model 231 Install adapter (1) in place of expansion valve with new sealing rings (2, 6).
		Screw/bolt on expansion valve	*BA83.30-P-1002-01A
		Adapter	Fig 4
		Adapter hose	Fig 2
3	Connect test equipment to adapter (1)
	000 588 10 21 00 Leak tester		WS83.00-P-0008B
4	Check evaporator for leaks	To do so, fill system with a system pressure of 15 bar. Pressure must be maintained for at least 4 hours. Temperature changes during the pressure test (e.g. through change in weather or cooling down of the engine compartment overnight) can cause pressure surges. Consistent ambient conditions must be strictly ensured. With negative findings: Replace evaporator, see: ↓ Remove/install evaporator
		Model 117, 156, 176, 242, 246	AR83.30-P-5540NKB
		Model 231	AR83.30-P-5540RK
5	Remove test equipment from adapter (1)
6.1	Remove adapter (1)	Model 117, 156, 176, 242, 246
		Adapter	Fig 3
6.2	Remove adapter (1) and adapter hose	Model 231
		Adapter	Fig 4
		Adapter hose	Fig 2
7	Install expansion valve	Model 231	AR83.30-P-5520RK
		Model 117, 156, 176, 242, 246 Install expansion valve with new sealing rings (2, 6).	AR83.30-P-5520NKB

AIR CONDITIONING

Number	Designation		Model 117	Model 156
BA83.30-P-1001-01G	Bolt on expansion valve	Nm	3, 5	3, 5

AIR CONDITIONING

Number	Designation		Model 176, 246	Model 242
BA83.30-P-1001-01G	Bolt on expansion valve	Nm	3, 5	3, 5

AIR CONDITIONING

Number	Designation		Model 231
BA83.30-P-1002-01A	Screw/bolt on expansion valve	Nm	5, 5

Fig 2: Identifying Adapter Hose (140 589 51 63 01)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Adapter (246 589 02 63 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Adapter (463 589 01 63 00)

Courtesy of MERCEDES-BENZ USA