ME engine coolant heat management function - GF07.61-P-4016VB
ENGINE 272.920 in MODEL 203
ENGINE 272.922 in MODEL 211
ENGINE 272.940 in MODEL 203, 209
ENGINE 272.941 in MODEL 203
ENGINE 272.943 in MODEL 211
ENGINE 272.944 in MODEL 211
ENGINE 272.945 in MODEL 251
ENGINE 272.946 in MODEL 221
ENGINE 272.960 in MODEL 203, 209
ENGINE 272.964 in MODEL 211, 219
ENGINE 272.965 in MODEL 221
ENGINE 272.966 in MODEL 230
ENGINE 272.967 in MODEL 164, 251
ENGINE 272.970 in MODEL 203
ENGINE 272.972 in MODEL 211
ENGINE 272.975 in MODEL 221
ENGINE 273.922 in MODEL 221
ENGINE 273.923 in MODEL 164
ENGINE 273.924 in MODEL 221
ENGINE 273.943 in MODEL 164
ENGINE 273.960 in MODEL 211, 219
ENGINE 273.961 in MODEL 216, 221
ENGINE 273.962 in MODEL 211
ENGINE 273.963 in MODEL 164, 251
ENGINE 273.965 in MODEL 230
ENGINE 273.967 in MODEL 209
ENGINE 273.968 in MODEL 221
Shown on engine 272
Heat management controls the coolant temperature of the engine.
Advantages are
- The operating temperature is reached more rapidly
- Emissions reduced
- Fuel savings up to around 4%
- Improved heat comfort.
Heat management is dependent on the following input signals:
- Coolant temperature
- Engine load
- Engine speed
- Outside air temperature
- Intake air temperature
- Actuation of the suction fan
- Vehicle speed
- Driver type (quiet or sporty).
Depending on the operating conditions, the ME control unit actuates the heater element in the three-disk thermostat depending on performance mapping via a ground signal. The voltage is supplied to the three disk thermostat via circuit 87. The coolant temperature is regulated between 80°C and 100°C via the duty cycle.
If the coolant temperature is too high, the coolant temperature warning lamp in the instrument cluster is actuated. To do this, the ME control units sends a CAN command to the instrument cluster.
Full throttle position (A)
For a cold start, the three disk thermostat is not actuated and additionally, when the vehicle heater is shut off, the heater circuit is closed via the heater system shutoff valve. The standing coolant now warms up very quickly. Heat is sent from the engine oil via the heat exchanger at the front of the engine.
At a coolant temperature from around 70°C or from around 45°C (with outside temperature above around 12°C), switching from full throttle to short-circuit operation takes place. In addition, the closing disk opens due to pressure via the running coolant pump over around 3500 rpm.
Short-circuit operation position (B)
Short-circuit operation with the engine and heat exchanger can be throttled so that the heater responds more rapidly.
Mixed fuel operation position (C)
Temperature regulation with the three-disk thermostat is not enabled until the coolant temperature following start reaches around 98°C. At outside temperatures above around 12°C it is active immediately.
At partial load, the three-disk thermostat regulates at an increased coolant temperature of around 100°C.
To prevent critical temperatures, the increased coolant temperature range is reduced under the following conditions to around 90°C (with outside temperature below 12°C) or to around 80°C (with outside temperature over 12°C):
- Engine speed greater than 3000 rpm
- Engine load more than 30%
- Intake air temperature more than around 38°C
- sporty driver detected.
Maximum radiator operation position (D)
The three-disk thermostat is actuated constantly during radiator operation. Above around 110°C, the three-disk thermostat is always fully opened independently of actuation (emergency operation function).
| Component description for the ME-SFI [ME] control unit | GF07.61-P-6000V | ||
| Component description for the three-disk thermostat valve | GF20.10-P-3160V | ||
| Component description for the heating system shutoff valve | Model 203, 209, 211, 219, 164, 251, 216, 221, 230 | GF20.00-P-2200V | |
| Component description for the coolant temperature sensor | GF07.04-P-6040V | ||
| Component description for the crankshaft Hall sensor | GF07.04-P-6220V | ||
| Component description for the hot film mass air flow sensor | GF07.07-P-6000V |