Audi A4: Engine

 A/C Compressor Regulator Valve -N280-, Removing and Installing

  Note Certain functions on the A/C Compressor Regulator Valve -N280- (for example, a stuck valve or a disruption in the coil) can lead to a complaint regarding the A/C compressor (A/C system doesn't cool, the evaporator ices over, etc.). If the cause is with the A/C Compressor Regulator

 Steering Column, Checking for Damage

Visual Check Components of the steering column must not show any indications of damage. Function Test The steering column must turn without catching or difficulty of movement. The steering column must adjust easily from side to side and vertically (this test is only possible when installed)