Working On Refrigerant Circuit

• Refrigerant oil is hygroscopic, which means that it absorbs moisture from the surrounding air. If the refrigerant circuit was open for a longer period of time, the refrigerant oil and the dryer element will be saturated with moisture. Before filling, thoroughly evacuate the refrigerant circuit and replace the dryer element.
• Welding and soldering procedures close to components of the A/C system may only be performed if the refrigerant circuit is drained.
• It is possible that the plastic foil on the inside will tear and destroy the refrigerant lines in this way. Never bend refrigerant lines with a radius smaller than r = 10 cm.

North American Region (NAR):

• Such components must be replaced with genuine parts.
• Evaporators must meet the vehicle specific SAE standards.