Vehicle cooling system Audi 80 B3, petrol

Cooling system specifications
System type - Sealed radiator and expansion tank, belt-driven water pump, temperature-controlled electric cooling fan. Expansion tank cap opening pressure -...

General description of the cooling system
The cooling system is of a sealed type. It has a radiator installed in the front (4-cylinder engine) or from the side (5-cylinder engine), a water pump driven...

Cooling system maintenance
Perform the following procedures at the intervals given in Section " Maintenance " at the beginning of the Guide. Checking for leaks in the cooling system 1....

Draining the coolant
1. It is preferable to drain the cooling system when the engine is cold. If this is not possible, place a cloth over the expansion tank filler cap, slowly...

Flushing the cooling system
1. Whenever the coolant is drained from the cooling system, it should be flushed with clean water to remove any rust, scale or sediment build-up. If the...

Filling the cooling system
1. Connect all hoses, tighten the fastening clamps. 4-cylinder engines 2. Pour coolant into the expansion tank to the level marked below the seam. 5-cylinder...

Antifreeze mixture
1. The cooling system is filled at the factory with an antifreeze mixture that contains a corrosion inhibitor. The antifreeze mixture prevents freezing, raises...

Radiator — removal, inspection, cleaning and installation
1. Disconnect the negative battery cable. 2. Drain the cooling system as described in Chapter 3 . 4-cylinder engines 3. On models equipped with air...

Thermostat — removal, inspection and installation
1. On 4 - cylinder engines, the thermostat is located at the base of the water pump housing, and on 5 - cylinder engines, behind the water pump on the left...

Water pump — removal and installation
1. Drain the cooling system as described in Chapter 3 . 4-cylinder engines 2. Remove the alternator and drive belt as described in Section 12 , Chapters 5 and...

Cooling Fan Thermal Switch — Checking, Removing and Installing
1. If the thermal switch at the base of the radiator is damaged, most likely due to a break in the circuit. Because of this, the fan motor will not turn on...

Coolant Temperature Sensor — Removal and Installation
1. The coolant temperature sensor is located on the back of the coolant outlet pipe, on the left side of the cylinder head on 4-cylinder engines with a...

Plugs — replacement
1. If there is a leak through the plugs (photo), they can be replaced as follows. First, drain the liquid from the cooling system as described in Chapter 3 ....

Troubleshooting the cooling system
Overheat Low coolant level The pressure cap is faulty Thermostat stuck in closed position The drive belt is broken (4 cylinder engines only) Thermal switch is...

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80(B4, 1991-1996)

80(B3, 1986-1991)

80(B3, 1986-1991, petrol)

80(B2, 1979-1986)