Engine cooling system VW Transporter T4

Checking the pressure in the engine cooling system
The tightness of the cooling system and the operation of the overpressure valve in the radiator cap can be checked with the VW 1274 and 1274/1 A tester. Examination 1. Install a...

Coolant circulation
Diesel engine coolant hose connection diagram 1. Expansion tank; 2. Radiator; A. Up; b. Down; 3. Water circulation pump; 4. Threaded coolant drain plug; 5. Coolant thermostat; 6....

Radiator and antifreeze — design description
Radiator and fan 1. Bolt, 10 Nm; 2. Lock support; 3. Radiator grille; 4. Guide air intake; 5. Rubber mount; 6. Radiator; 7. O-ring; 8. Fan temperature sensor, 25 Nm; 9. Radiator...

Removal and installation of a radiator
Removing 1. Pull out the radiator. To do this, unscrew the mounting bolts (1) right and left. 2. Swing forward the radiator with lock support (arrow). 3. Disconnect the plug from...

Coolant replacement
The coolant needs to be replaced only after a repair in which it was drained. Coolant replacement is not included as part of the annual service. If the cylinder head, cylinder...

Coolant thermostat — removal, inspection and installation
Water pump, coolant thermostat, oil cooler for 4-cylinder petrol and diesel engines 1. Bolt, 20 Nm; 2. Belt pulley; 3. V-belt water pump and alternator; 4. Bolt, 10 Nm; 5. Water...

Water pump — removal and installation
4 cylinder engine Removing 1. Drain coolant. 2. Remove thermostat. 3. Unscrew the bolts of the V-belt pulley, to do this, compress and hold the V-belt. 4. Remove V-belt. 5. Loosen...

Fan motor temperature sensor — check
The temperature sensor must be checked if the fan does not turn on when the engine is hot. Check condition: coolant thermostat, radiator and cooling system plug are in good...

Coolant circulation temperature sensor
Temperature sensor check A. Connecting plug; B. Thermal sensor; 1, 2, 3, 4. Contacts Examination 1. Turn the ignition on and off. 2. Remove connector (A). 3. Connect pins 1 and 2...

Diagnosis of malfunctions of the cooling system
Cause Elimination Method Too little coolant in the system The expansion tank must be filled completely up to the marking. Check the tightness of the system Coolant thermostat does...

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