Removing and installing, replacing heater (automatic heating and air conditioning system) BMW 5 E39
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Recover the refrigerant.
Release the clamps securing the left and right air ducts, air duct and remove the crank.
Refit the air duct to the panel front end, enter the first crank and the bottom edge of the microfilter.
Danger of scalding!
Only perform these tasks on a cold engine.
Release clamps (1 – 3) and remove the coolant hoses. Gently blow pipes to remove residual liquid coolant from the heating element.
Fill up with coolant and bleed the cooling system.
Remove the bolts on the bulkhead.
Release screws and remove the suction and discharge piping.
Replace the O-rings.
Further operations are described in the section Removing and installing, replacing heater (heating system).