Audi Workshop Service and Repair Manuals > A4 Mk2 > Power unit | 4-cylinder engine (5-valve turbo), mechanics | Engine cooling | Removing and installing parts of cooling system | Removing and installing coolant pipe (bottom)

Thermostat housing - exploded view of components > < Removing and installing coolant pipe (top)

Removing and installing coolant pipe (bottom)

Removing and installing coolant pipe (bottom)

Special tools and workshop equipment required

t	Hose clip pliers -V.A.G 1921-

Removing

–	Drain off coolant → Chapter.

W00-0464

–	Remove support for intake manifold (unscrew bolts -arrows-).

A15-10144

–	Move wiring clear of bottom coolant pipe.

–	Detach coolant hoses -arrows- from coolant pipe (bottom).

–	Unscrew bolts -1- and -2- and pull coolant pipe out of thermostat housing.

Installing

Installation is carried out in the reverse order; note the following:

Note

t	Renew O-rings.

t	Secure all hose connections with the correct type of hose clips (same as original equipment) → Parts catalogue.

–	Fill cooling system → Anchor.

Tightening torques

A19-10118

Component		Nm
Coolant pipe (bottom) to:	Thermostat housing	10
Coolant pipe (bottom) to:	Oil cooler	23 → Remark
Support for intake manifold to:	Intake manifold	23
Support for intake manifold to:	Bracket for ancillaries	23

¹⁾	Install using locking fluid; locking fluid → Parts catalogue.

Power unit
4-cylinder engine (5-valve turbo), mechanics
Engine cooling / Removing and installing parts of cooling system
Removing and installing coolant pipe (bottom)

Thermostat housing - exploded view of components > < Removing and installing coolant pipe (top)