Heat Pump Valve Unit Bracket, Removing And Installing, 4-Valve Block Through 02/2021: Removing
- For all the following work, immediately close the open lines and connections with clean plugs from the Engine Bung Set :VAS6122 .
Working on a high-voltage system when activated or with the ignition turned on
-- Switch off (deactivate) the "parking air conditioner". Refer to Owner's Manual.
-- Switch the ignition on.
-- Initiate the basic setting of the A/C system using the Thermal Management Control Module -J1024- and open the electric valves using the routine Refrigerant Circuit, Extract, Evacuate and Fill in the Vehicle Diagnostic Tester.
-- Switch the ignition off.
-- Discharge 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) .
-- Remove the left front wheel housing liner. Refer to OVERVIEW - FRONT WHEEL HOUSING LINER .
-- Remove the front bumper cover end plate. Refer to OVERVIEW - BUMPER COVER .
-- Loosen the left bumper cover on the fender and push it outward. Refer to OVERVIEW - BUMPER COVER .
-- Move the coolant expansion tank for the high-voltage system cooling circuit to the side (do not drain the coolant) and remove the bracket for the coolant expansion tank. Refer to the appropriate service information .
-- Loosen the bolt -arrow- three turns (do not remove).
-- Remove all lines and connectors on the bracket -A-.
Danger of 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.
- Evacuate or drain refrigerant and open the refrigerant circuit immediately.
- If more than 10 minutes elapse after extracting or draining the refrigerant and the refrigerant circuit was not opened, extract or drain the refrigerant again. Pressure develops in the refrigerant circuit due to evaporation.
-- Remove the bolt -B- and remove the refrigerant line -D-.
-- Remove the bolts -arrows-.
-- Remove the bolts -C- and then remove the bracket -A- downward.
-- Remove the bolts -D- and refrigerant lines -E-.
-- Remove the bolt -I- and then remove the refrigerant line -H- from the check valve -J-.
-- Remove the nut -B- and refrigerant lines -A and C- to the inner heat exchanger.
-- Remove the bolts -B and F- and remove the refrigerant lines -C and E-.
-- Remove the bolts -arrows-.
-- Remove the heat exchanger -A- with refrigerant receiver -D- downward and secure in the position shown.
-- Disconnect and free up the connectors -C, D and G- and free it up.
-- Mark the layout -E- at the connections for the high-voltage battery heat exchanger.
-- Loosen the hose clamps -F- using the Pliers :VAS5024A and remove the coolant hoses -E- from the connections of the high-voltage battery heat exchanger.
Dripping coolant can contaminate the refrigerant circuit.
- Immediately seal off any open lines and connections with clean plugs from the Engine Bung Set :VAS6122 .
- Remove any dripping coolant with absorbent paper.
-- Free up the coolant line -A- to the auxiliary radiator and remove the bolt -B-.
-- Remove the bolt -C- and refrigerant lines -E-.
-- Remove the bolt -D- and remove the coolant lines to the auxiliary radiator.
-- Remove the bolt -arrow- from the bracket -A-.
-- Lift the bracket -a- and guide it out of the guide in the longitudinal member.
-- Remove the heat pump valve unit with the bracket carefully downward.