Heat Pump Valve Unit Bracket, Removing And Installing, 4-Valve Block Through 02/2021: Installing

WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

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

There can be refrigerant oil in the removed valve block that must be redelivered to the refrigerant circuit (with the new component). Refer to Refrigerant Circuit Components, Replacing or COMPONENTS, REPLACING .

-- Replace the O-rings. Refer to REFRIGERANT CIRCUIT SEALS .

-- Install the refrigerant lines on the valve block and pay attention to the correct routing. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT, VEHICLES WITH HIGH-VOLTAGE SYSTEM .

-- Check the routing after securing refrigerant lines. They must be inserted in their brackets and must not come into contact with other components.

-- Reinstall the rest of the removed components in the reverse order and reattach the loosened components.

-- Evacuate and fill the refrigerant circuit. Refer to Refrigerant Circuit (Refrigerant R134a Servicing, Refrigerant Circuit, Working with A/C Service Station) or Working with A/C Service Station (1 Of 2) / Working with A/C Service Station (2 Of 2) .

-- Switch the ignition on.

-- Initiate the basic setting of the A/C system using the Thermal Management Control Module -J1024- and activate the electric valves using the routine Stop routine refrigerant circuit filling/flushing in the Vehicle Diagnostic Tester.

-- Fill and bleed the coolant for the high-voltage system cooling circuit. Refer to [For engine(s) DKMB, DLZA] COOLANT, DRAINING AND FILLING .

-- Operate the A/C system after charging the refrigerant circuit. Refer to A/C SYSTEM, STARTING AFTER CHARGING REFRIGERANT CIRCUIT, VEHICLES WITH HIGH-VOLTAGE SYSTEM .