Repair of the cooling system of car engines Volkswagen Passat B3 1988-1993

Coolant circulation
Coolant circulation is controlled by a thermostat. While the engine is cold, the coolant circulates only in the cylinder head, as well as in the cylinder block and heat exchanger....

Coolant pump / thermostat
4-cylinder carbureted engine 1 - temperature sensor, 10 Nm 2 - thermal switch, 10 Nm For automatic engine start. 3 - connecting pipe 4 - locking bracket 5 - thermal switch, 10 Nm...

Coolant replacement
The coolant should only be changed during repairs to the cooling system in which the coolant is drained. Fluid replacement is not included as part of the annual service. If the...

Removing and installing / checking the thermostat
4 cylinder engine Removing Vehicles with power steering: Remove V-belt, tilt power steering vane pump forward, see chapter « Steering ». Place a suitable vessel under the coolant...

Removal and installation of the pump of a cooling liquid
4 cylinder engine Removing Drain the coolant into a suitable container. Remove thermostat. Loosen the V-belt pulley bolts by pressing and holding the V-belt. Remove V-belt, see...

Checking the thermal switch of the electric fan
The thermal switch must be checked if the fan does not turn on when the engine is hot. Prerequisite for checking: thermostat, radiator and cooling system cap are in order. The...

Removal and installation of a radiator
Removing Drain the coolant into a suitable container. Disconnect the electrical plugs at the thermal switch at the bottom left of the radiator and at the fan motor. Release the...

Checking the cooling system
Leaks in the cooling system and the functioning of the safety valve in the radiator cap can be checked using the VAG 1274 and 1274/4. Install the device on the filler neck of the...

Checking additional fan activation
In all gasoline engines, except for those with the designation 1F and RP (engines with Mono-Jetronic system), additional activation of the fan is provided to avoid excessive...

Checking the low coolant level indicator
Depending on the model and version, VW PASSAT vehicles are equipped with a low coolant level indicator. For this, a sensor is installed in the expansion tank. Examination The...

Checking the auxiliary coolant pump
Diesel engine with gas turbine supercharging An additional coolant pump is installed in the cooling system of the supercharged diesel engine next to the gearbox housing (arrow)....

Visual inspection of tightness
Check coolant hoses for porosity by compressing and bending them, replace hardened hoses. The hoses must be put on the connecting pipes to the end. Check the tightness of the hose...

Checking the coolant level
The coolant level should be checked regularly, at least before every big trip. If the coolant level is too low on vehicles with a low coolant warning light, the warning light on...

Checking antifreeze
The concentration of antifreeze in the coolant of the cooling system must be checked regularly before the onset of winter. Warm up the engine until the expansion tank feels warm...

Antifreeze specifications
The cooling system is filled year-round with a mixture of water and antifreeze VAG G-011-VBC. In addition to lowering the freezing point of the coolant, G-011-VBC prevents the...

Diagnosis of malfunctions of the cooling system
Fault: Coolant temperature too high, warning light flashes when engine is hot.

This section is available on russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian

Car cooling system Volkswagen Passat B3