Water Pump: Testing and Inspection

After-run coolant pump -V51-






The after-run coolant circulation pump -arrows- is generally activated for 10 - 12 minutes about 15 seconds after ignition is shut off. If the coolant temperature is above 92 C, the radiator fan -V7- will also be turned on.

Special tools and equipment

- Hand multimeter VAG 1526 or multimeter VAG 1715
- Wiring diagram

Check conditions






- Fuse 34 must be OK.

Test sequence

- Start engine and idle briefly.
- Switch ignition off.

Continued coolant circulation pump (V51) must start after about 15 seconds.

If pump does not run:
- Pull 2-pin connector off pump.
- Attach multimeter for measuring voltage to contacts 1+2 of connector.
Specification: 11 - 15V

If the specification is obtained:
- Replace continued coolant circulation pump.

If no voltage is present:
- Check wiring from relay plate to continued coolant circulation pump.