Heater Core Coolant Pipes, Removing And Installing: Installing

WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Heater Core Connections, Coolant Pipe And O-Ring Seal

Courtesy of AUDI OF AMERICA, LLC

Install in the reverse order of removal while noting the following:

-- Check the heater core connection -3- and the connection -2- for the coolant pipes for damage or debris.

-- Clean and smooth the sealing surface for the O-ring.

-- Coat the new O-ring -4- with coolant and place on the coolant pipe -1-.

CAUTION:

There is a risk of heater core malfunctions due to faulty seals and leaks.

- Never pinch the seals.

- Never tilt the coolant pipes.

- Slide the coolant pipes on all the way.

-- Slide the coolant pipes into the heater core until stop.

-- Position a new clip -5- and screw clamp -2- on the coolant pipe/heater core connection.

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolt -3-.

-- Check the clamp -5- and screw-type clamps -2- for proper seating on the heater core and the coolant pipe connections. They must not be touching the air distribution housing or any other components.

-- Install the heater and A/C unit. Refer to HEATER AND A/C UNIT, REMOVING AND INSTALLING .