2000 AUDI A8 coolant

19-15


- Loosen bleeder screw on lower coolant line (arrow) under expansion
tank (if necessary, unbolt expansion tank).
- Top off coolant until it flows out from bleeder screw.
- Close bleeder screw and tighten to 20 Nm (15 ft lb).

- Loosen bleeder screw on front coolant line (arrow) between power
steering pump and left-side of cylinder head.
- Top off coolant until it flows out from bleeder hole in coolant line.
- Close bleeder screw and tighten to 20 Nm (15 ft lb).
- Top up coolant to MAX mark.
- Install coolant expansion tank cap.
- Set heater controls to maximum heat position.
- Start engine and let run at idle for approx. 10 minutes.
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19-16

- Raise engine speed to approx. 2000 rpm for
approx. 5 minutes.

- Allow engine to idle until lower coolant hose on
radiator is hot.

- Check coolant level and top-off if necessary.
When engine is at normal operating
temperature, coolant level must be on MAX
mark. When engine is cold, coolant level must
be between MIN and MAX marks.

WARNING!

The cooling system is pressurized when the
engine is warm. When opening the expansion
tank, wear gloves and other appropriate
protection, cover the cap with a cloth and
open carefully to relieve system pressure
slowly.
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19-17

Radiator, removing and installing


Removing

- Remove front bumper.

Repair Manual, Body Exterior, Repair Group
63


- Drain coolant at drain plug (arrow) page 19
-11
.

Vehicles with automatic transmission - Disconnect coolant hoses at radiator, unhinge clamp from connection
flange (arrow).
- Disconnect connector from temperature switch at bottom-left of
radiator.
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19-19

All models

Installing
Installation is the reverse of removal, noting the following:
Vehicles with automatic transmission
Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 37

Tightening torques - Release both radiator retaining bolts, pull up and remove (arrows).
- Tilt radiator toward front, lift up and remove.
- Fill up coolant page 19
-11
.
- Check ATF level.Component
Tightening torque
Condenser to radiator 10 Nm (7 ft lb)
Coolant line to radiator 10 Nm (7 ft lb)
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19-20

Coolant pump, removing and installing


Notes:

Always replace seals and gaskets.
Cover the toothed belt with a cloth to protect it
from coolant before removing the coolant pump.

Removing

- Remove front bumper.

Repair Manual, Body Exterior, Repair Group
63


- Move lock carrier into service position.

Repair Manual, Body Exterior, Repair Group
50


- Remove ribbed belt page 13
-8 .

- Remove toothed belt page 13
-12
.
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- Drain coolant page 19
-11
.
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19-21


- Remove the following components before removing coolant pump:
1 - Toothed belt tensioner roller
Tightening torque: 20 Nm (15 ft lb)
2 - Idler roller
Tightening torque: 45 Nm (33 ft lb)


- Remove coolant pump mounting bolts -1- and remove coolant pump -
2-.
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19-22

Installing
Installation is the reverse of removal, noting the
following:

- Remove any remaining sealant from sealing
surfaces of coolant pump and cylinder block.

- Clean sealing surfaces so they are completely
free of any oil or grease.

- Install new gasket on water pump flange.

- Install coolant pump -2- into cylinder block and tighten all 9 mounting
bolts (arrow -2-) to 10 Nm (7 ft lb).
- Install rear toothed belt guard on water pump housing (arrow -1-).
Tightening torque: 10 Nm (7 ft lb).
- Install and tension toothed belt page 13
-12
.
- Install toothed belt guard.
- Install ribbed belt page 13
-8 .
- Fill cooling system with coolant page 19
-11
.
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