Water Pump: Testing and Inspection

After-run coolant pump, checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required





^ VAG 1527B voltage tester





^ V.A.G 1594 A Auxiliary test set
^ Wiring diagram

Check conditions





^ All fuses must be OK.
Test sequence
- Pull 2-pin connector off after-run coolant pump (V51)-arrow-.





- Connect contacts of after-run coolant pump (V51) to battery using aux. cables from V.A.G 1594. After-run coolant pump must run.
If the after-run coolant pump does not run:
- Replace after-run coolant pump (V51).
If the after-run coolant pump (V51) runs:
- Switch ignition off and on again.





- Connect VAG 1527B voltage tester to disconnected connector for after-run coolant pump (V51) with auxiliary cable from V.A.G 1594 A LED must light up.

Note: This check must be performed within minutes after switching ignition off.

If the LED does not light up:
- Locate and repair open circuit using wiring diagram.