Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fan control, function - GF07.61-P-3023AMG
ENGINE 156.980 in MODEL 164, 251 up to Model Year 8
ENGINE 156.982 in MODEL 209
ENGINE 156.983 in MODEL 211, 219
ENGINE 156.984 in MODEL 216, 221 up to Model Year 8
The ME-SFI [ME] control unit indirectly actuates the electric suction fan engine and AC continuously.
The fan specified speed is transmitted by the ME-SFI [ME] control unit via a PWM signal (pulse width modulated signal).
The duty cycle of the PWM signal is 10 to 90 %.
Meaning:
10% Electric suction fan "OFF"
20% Electric suction fan "ON", minimum speed
90% Electric suction fan "ON", maximum speed
The AAC [KLA] control unit transmits the status of the automatic air conditioning via the CAN data bus to the ME-SFI [ME] control unit. The fan specified speed is dependent on this and on the coolant temperature.
The engine and AC electric suction fan runs on for up to 5 minutes at "Ignition OFF" if the coolant temperature, the engine oil temperature or the temperature of the ME-SFI [ME] control unit exceeds specified maximum values.
If the battery voltage drops excessively during this operation, engine-off running is suppressed.
Fan emergency operation
If actuation is faulty, the engine and AC electric suction fan runs at maximum rpm.
| Component description for the coolant temperature sensor | B11/4 | GF07.04-P-6040AMG |
| Component description for the crankshaft Hall sensor | B70 | GF07.04-P-6220AMG |
| Component description for the ME-SFI [ME] control unit | N3/10 | GF07.61-P-6000AMG |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.