audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Water Pump > < Checking|Page 2125
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Turbocharger Coolant Pump: Testing and Inspection

WORK SEQUENCE

-

Run engine until radiator cooling fan switches ON at HIGH speed

-

Turn OFF engine and wait five minutes

-

After approx. five minutes, secondary coolant pump and radiator cooling fan must switch ON

NOTE:  Radiator cooling tan will run on LOW speed.

If Coolant Pump And Radiator Fan DO NOT Run: 

-

Remove harness connector from secondary coolant pump thermo-switch and bridge terminals 

-

Coolant pump and radiator fan must run

IF YES:
-

Replace secondary coolant pump thermo-switch

IF NO:
-

Check for open circuit in coolant pump circuit using wiring diagram

Water Pump > < Checking|Page 2125