Necessary preliminary tasks

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Switch off ignition.
Remove air duct.
Remove fan cowl with electronic fan.

Check production date.

Fig 1: Locating Production Date

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Clamp off low-temperature feed lines with special tool 13 3 010.

Function test:

Observe diagnosis instructions.

Fig 2: Identifying Low-Temperature Feed Lines And Special Tool 13 3 010

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Check function of radiator.

Clamp off low-temperature feed line (1) at coolant pump outlet or radiator inlet with special tool 13 3 010 (see arrows).

Fig 3: Locating Low-Temperature Feed Line At Coolant Pump Outlet Or Radiator Inlet

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Automatic transmission only

Check function of heat exchanger.

Clamp off low-temperature feed line (1) at coolant pump outlet with special tool 13 3 010 (see arrow).

Clamp off low-temperature feed line (2) at oil-coolant heat exchanger with special tool 13 3 010 (see arrow).

Fig 4: Locating Low-Temperature Feed Line At Coolant Pump Outlet And Oil-Coolant Heat Exchanger

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Check heating and cooling circuits in accordance with diagnosis instruction.