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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> 87 Air Conditioning >> Front Heater And A/C Unit >> Heater And A/C Unit, Removing And Installing >> Heater And A/C Unit, Removing And Installing >> Installing

Heater And A/C Unit, Removing And Installing: Installing

Install in reverse order of removal and note the following:

-- Coat the grommets -B and C- with grease and install it in the plenum chamber rear panel -A-.

GWWA87-11921Courtesy of AUDI OF AMERICA, LLC

-- Insert the support ring -D- in the grommet.

-- Check the position of the coolant and refrigerant lines in both grommets in the plenum chamber rear panel, and if necessary, align the heater and A/C unit so that the lines are not tensioned in the grommets.

-- On a vehicle with an Auxiliary Heater Heating Element -Z35-, install the connector.

-- Remove the refrigerant line from the front expansion valve.

-- Connect the coolant hoses -A and B- to the heater core coolant pipes (pay attention to the marking) and secure them with a clamp.

GWWA87-12130Courtesy of AUDI OF AMERICA, LLC

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

-- Drain and fill the coolant circuit. Refer to COOLANT, DRAINING AND FILLING .

-- Perform a basic setting on the A/C system. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"  function.

-- Operate the A/C system after charging the refrigerant circuit.