Audi Workshop Service and Repair Manuals > A4 Mk1 > Power unit | 4-cylinder engine (2-valve, roller rocker fingers), mechanics | Engine cooling | Removing and installing parts of cooling system | Removing and installing coolant pipe (bottom)

Removing and installing thermostat > < 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-

W00-0464

Removing

–	Drain off coolant → Chapter.

–	Remove intake manifold (top section) → Chapter.

–	Move wiring clear of bottom coolant pipe.

–	Disengage retaining clip on connecting flange to detach coolant hose going to heat exchanger at rear of coolant pipe -2-.

–	Detach coolant hose -4- going to oil cooler from coolant pipe.

–	Remove bolt -3-.

–	Push coolant pipe to rear and detach.

–	Remove plug -5- if necessary.

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.

–	Clean and smoothen sealing surface for O-ring as required.

–	Moisten new O-ring with coolant additive “G12+”.

–	Push coolant pipe into bore on cylinder block.

–	Install intake manifold (top section) → Chapter.

–	Fill cooling system → Anchor.

Tightening torques

A19-0048

Component	Nm
Coolant pipe to oil filter bracket	20
Screw-type clips for coolant hoses	2

Power unit
4-cylinder engine (2-valve, roller rocker fingers), mechanics
Engine cooling / Removing and installing parts of cooling system
Removing and installing coolant pipe (bottom)

Removing and installing thermostat > < Removing and installing coolant pipe (top)