Auxiliary Heater Control Module -J604- (WITH Auxiliary Heater Heating Element -Z35-), REMOVING AND INSTALLING: Removing

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

-- Switch the ignition on.

-- Set the airflow direction on the Front A/C Display Control Head -E87- / Front Information Display Control Head 2 -J1060- to "DEF" (for the windshield).

-- Set the temperature preset of the Front A/C Display Control Head -E87- / Front Information Display Control Head 2 -J1060- for the right side to "Warm" (only on a "Low" or "Mid" A/C system).

-- Move the right front seat all the way to the rear.

-- Switch off the ignition.

LHD vehicle

-- Remove the footwell vent on the front passenger side. Refer to FRONT PASSENGER SIDE FOOTWELL VENT, REMOVING AND INSTALLING .

-- If equipped, remove the air duct for the glove compartment cooling. Refer to AIR GUIDE FOR GLOVE COMPARTMENT COOLING, REMOVING AND INSTALLING .

-- Remove the Fresh Air Blower -V2- with the Fresh Air Blower Control Module -J126-. Refer to Fresh Air Blower -V2- WITH Fresh Air Blower Control Module -J126-, REMOVING AND INSTALLING .

RHD vehicles

-- Remove the driver side footwell vent. Refer to DRIVER SIDE FOOTWELL VENT, REMOVING AND INSTALLING .

-- Remove the mounting bracket for the brake pedal. Refer to MOUNTING BRACKET, REMOVING AND INSTALLING - 4M or MOUNTING BRACKET, REMOVING AND INSTALLING - 4MN .

Continuation for all vehicles

CAUTION:

Risk of short circuit when disconnecting the voltage supply to the.

- Interrupt the power supply to the Auxiliary Heater Heating Element -Z35- by pulling on the related fuse. Refer to Wiring Diagram.

- Before loosening the hex nut check with a voltage tester that there is no more voltage.

-- Interrupt the power supply to the Auxiliary Heater Heating Element -Z35- by pulling on the related fuse. Refer to Wiring Diagram.

Vehicles with a "Mix" or "High" A/C system, PR number 9AU/ 9AH/ 9AQ/ 9AE

-- Remove the bracket for the right adjustment motors. Refer to BRACKET FOR RIGHT ADJUSTMENT MOTORS, REMOVING AND INSTALLING (ON A "Mix" OR "High" A/C SYSTEM), PR NUMBER 9AU/ 9AH/ 9AQ/ 9AE .

-- Remove the connector from the Rear Air Distribution Door Motor -V427- / Rear Air Quantity Motor -V443-. Refer to Rear Air Distribution Door Motor -V427- / Rear Air Quantity Motor -V443- / Right Rear Air Distribution Motor -V594-, REMOVING AND INSTALLING .

Continuation for all vehicles

Courtesy of AUDI OF AMERICA, LLC

-- Release and disconnect the connector -A- from the Auxiliary Heater Control Module -J604- -D-.

-- Again check between connections -C- (positive) and -B- (negative) for example using a voltage tester. There must no longer be any voltage present (danger of short circuit).

To prevent the -C- (positive) and -B- (negative) connections from being switched, they have different diameters (M6 threads and M8 threads on the Auxiliary Heater Control Module -J604-).
If connections (-C- and -B-) are interchanged, the Auxiliary Heater Control Module -J604- can no longer regulate the current so that current flows continuously through the Auxiliary Heater Heating Element -Z35- (unregulated with maximum heat output).

-- Remove the wire connections -B and C- to the Auxiliary Heater Control Module -J604-.

-- Individually insulate the wire connections -B and C- after removal (risk of short circuit).

-- Remove the bolts -E-.

CAUTION:

There is a risk of burns by the metal surfaces on the auxiliary heater heating element. Heating elements can be very hot.

It is possible for the skin to be burned.

- Wear safety gloves.

- Never touch the metal surfaces of the heating element.

-- Remove the Auxiliary Heater Control Module -J604- (with the Auxiliary Heater Heating Element -Z35-) -D- from the installation slot on the heater and A/C unit.