Cooling system specifications (Audi 100 C3)

System type - Sealed radiator with expansion tank, belt-driven water pump, temperature-controlled electric cooling fan

Filler cap opening pressure - 1.2-1.35 bar

Thermostat

Opening start temperature:

• Four-cylinder engines - 85°C
• Five-cylinder engines - 87°C

Full opening temperature:

• Four cylinder engines - 106°C
• Five-cylinder engines - 102°C
• Stroke (minimum) - 7.0 mm

Operating temperature of thermal switch cooling fan

Turn on:

• All engines except five-cylinder for North America - 93° - 98°C
• North American 5-cylinder engine - 88° - 93°C

Shutdown:

• All engines except five-cylinder for North America - 88° - 93°C
• North American 5-cylinder engine - 82° - 86°C

Antifreeze

Type/specification - VW/Audi G11, TL-VW 774 A

Concentration for protection up to: Percentage of antifreeze in total volume

• -25°C — 40
• -30°C — 45
• -35°C — 50

Tightening torques, Nm

• Radiator mount (except for the top bracket) — 20
• Radiator mount (top bracket) — 10
• Electric cooling fan and shroud - 10
• Air deflector housing - 10
• Thermal switch (on the cylinder head) — 25
• Water pump to engine - 20
• Thermostat coating - 10

(This article was copied from an online resource: AUDIMANUAL.RU)