Test protocol for fan speed, form

Branch/Agency company no. Customer

Vehicle ident No. Repair order no.

Tester: Name Date

License plate No. Original registration date Model Engine no. Operating hours / km

Measurement of fan speeds

Operating hours: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mileage in km: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EOL parameters (from Star Diagnosis): . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .

MR data record number: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Helical fan (M74): Yes  No



Before starting the measurements drive the vehicle until it is at operating temperature, the coolant temperature should be 85 °C.

First only the fan speeds should be measured.

Measurement of hydraulic pressures after consultation with Unimog Kundendienst Werk Wörth [Unimog factory service.

The plug of the combination sensor for boost pressure charge air temperature (B13) must be disconnected before the measurement (fault messages in the INS should be ignored).

Simulate the coolant temperature of measurements 2 to 4 with decade resistor (90 °C = 240 ohm, 95 °C = 212 ohm,
100 °C = 190 ohm). Check the adjusted coolant temperature in the INS or with Star Diagnosis.

Upon completion of the measurements erase fault memory using Star Diagnosis.

1. Measurement with unregulated fan (connector on solenoid valve for water radiator fan motor (Y5)

2. Measurement with regulated fan

3. Measurement with regulated fan

4. Measurement with regulated fan

5. Measurement with unregulated fan (connector on solenoid valve for water radiator fan motor (Y5)