Cooling system specifications (Audi A4 B6)

Design

Thermosiphon with vane water pump. Thermostatic control. With separate expansion tank. Electric fan, switched on and off from control unit

Coolant

a mixture of soft water and antifreeze (1:1), this composition provides frost resistance down to -35°C

Antifreeze

"G 012 A8D" (red color) or another one that complies with the VW/AUDI-TL-774-D standard, for example "Glysantin-Au-Protect/G30". It is allowed to use "G12" (TL-VW-774-F) purple. Antifreeze G12-lila (purple) can be mixed with antifreeze G12-rot (red). On an 8-cylinder engine - only "G12 Plus"

Gasoline

• 1.6L engines

6.5

• 1.8 and 2.0 l engines

7.0

• 2.4L engines

8.5

• 3.0L engines

9.0

• 4.2L engines

Diesel

• 1.9L engines

• 2.5L engines

The proportion of antifreeze in the coolant to ensure frost resistance

up to -25°C

40%

up to -35°C

50%

up to -40°C

60%

Pressure in the system

About 1.2 atm. (the exact value is indicated on the expansion tank cap). The lid should withstand pressure for two minutes.

Valve stroke

not less than 8 mm

Beginning of the opening

87°C

Full disclosure

102°C

The excess pressure valve opens, atm.

1.4-1.6

The valve opening pressure is indicated on the cover in atm. x 100. If, for example, the cover says "140/200", we are talking about a two-stage cover and the valve opening pressure is 1.4 and 2.0 atm.

Type

R134a (do not use R12)

Volume, gr.

480-530

Type

G 052 300 A2

Volume, cm ³

180±10

Water pump

Engines 1.6, 1.8, 2.0, 3.0 l

15

2.4L engines

10

Diesel engines 2.5 l

10