Heater And A/C Unit, Removing And Installing: Removing
To improve accessibility, additional components, for example the engine cover or air filter housing, must be removed (depending on engine version). Refer to ENGINE COVER, REMOVING AND INSTALLING or the appropriate service information. .
Vehicles with Refrigerant R134a
-- Discharge the refrigerant circuit. Refer to Working with A/C Service Station .
Vehicles with Refrigerant R1234yf
-- Discharge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, DISCHARGING .
Danger or frostbite due to refrigerant coming out under pressure.
Frostbite on the skin and other parts of the body is possible.
- Wear safety gloves.
- Wear protective eyewear.
- Extract refrigerant and open the refrigerant circuit immediately.
- If more than 10 minutes elapse after extracting the refrigerant and the refrigerant circuit was not opened, extract the refrigerant again. Pressure can develop in the refrigerant circuit due to evaporation.
Continuation for All Vehicles
-- Vehicles with an A/C system: remove the refrigerant line with the inner heat exchanger from the expansion valve. Refer to REFRIGERANT LINES WITH INNER HEAT EXCHANGER, REMOVING AND INSTALLING .
-- Place the :VAS6208 under the engine.
-- Mark the coolant hoses -1- and -4-.
The heater core is designed for a specific coolant flow direction. Therefore, coolant hoses must be connected on the correct sides.
-- Clamp off the coolant hoses -1 and 4- using :3094 .
The cooling system is under pressure when the engine is warm. There is a risk of scalding from hot steam and coolant.
Scalding the skin and other parts of the body is possible.
- Wear safety gloves.
- Wear protective eyewear.
- Reduce the pressure by covering the coolant expansion tank cap with a cloth and carefully opening it.
-- Lift the clips -2 and 3-.
-- Remove the coolant hoses -1 and 4- from the heater core for the heater.
-- Connect a suitable hose -A- to the upper connection of the heater core.
-- Hold a suitable container -B- under the lower connection to the heater core -C-.
-- Use a compressed air gun to carefully blow the remaining coolant through the hose -A- out of the heater core and into the container -B-.
-- Seal the open lines and connections with clean plugs from the :VAS6122 .
-- Remove the instrument panel crossmember. Refer to INSTRUMENT PANEL CROSSMEMBER, REMOVING AND INSTALLING .
-- Remove the air duct channel to the rear vent (vehicle-specific). Refer to AIR DUCTS, REMOVING AND INSTALLING .
-- Lift the rear footwell vent underneath the front seat and pull rearward to facilitate removing the footwell vent from the heater and A/C Unit.
-- Remove the rear footwell vent from the heater and A/C unit.
-- Disconnect the connector -3- from the Fresh Air Blower Control Module -J126-.
Pyrotechnic components can unintentionally deploy.
Risk of injury.
- Discharge static electricity: briefly touch the door striker.
-- Disconnect the connector -5- from the Airbag Control Module -J234- -2-. Refer to Airbag Control Module .
-- Cover the carpet and Airbag Control Module -J234- in the vehicle interior with waterproof foil and absorbent paper.
Risk of damaging the airbag control module. If moisture penetrates, the connectors will corrode.
Cover or seal the control module connectors after disconnecting to prevent moisture from entering.
-- Remove the condensation water drain hose -2- carefully from the heater and A/C unit -1-.
-- Remove the heater and A/C unit -1- from the bracket on the plenum chamber bulkhead.
-- Free up the line channel -3-.
-- Free up the wiring harness -2- at the mounts -4- -arrows-.
-- Remove the heater and A/C unit to the side.