Test step 4 - Coolant pump -V50- and related valves

Fig 1: Test Step 4 - Coolant Pump -V50- And Related Valves (Steps 4.1 To 4.3)

Courtesy of AUDI OF AMERICA, INC.

Fig 2: Test Step 4 - Coolant Pump -V50- And Related Valves (Step 4.4)

Courtesy of AUDI OF AMERICA, INC.

Fig 3: Test Step 4 - Coolant Pump -V50- And Related Valves (Steps 4.5 & 4.6)

Courtesy of AUDI OF AMERICA, INC.

NOTE: If complaints exist of no heating capacity and no malfunction can be found when performing this test and when testing the heating performance of the A/C system. See AUTOMATIC CLIMATE CONTROL SYSTEM HEATING PERFORMANCE AND OPERATION OF PUMP VALVE UNIT, TESTING . Check wiring to pump -V50- and valves -N175- and -N176- for incorrect connection according to the wiring diagram.