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Always remembered RIP
- Joined
- Mar 14, 2005
- Messages
- 164,073
- Reaction score
- 367
- Age
- 89
- Location
- Daventry
- Your Mercedes
- 2002 SL500, 216 CL500, all fully loaded
Coolant circuit, function
The coolant in the cooling system is brought into circulation by the When the coolant thermostat is in its closed state, the coolant
coolant pump. To allow the coolant to heat up more quickly in the flows to the coolant pump again and rejoins the circuit.
post-start phase, the coolant pump can be switched off by means When the operating temperature of the engine is reached, the
of the coolant pump switchover valve (Y133). The coolant pump coolant thermostat opens to switch in the radiator circuit, and the
switchover valve is actuated by the CDI control unit (N3/9). radiator then becomes part of the coolant circuit.
The coolant pump pumps the coolant into the crankcase via 2 Depending on the position of the coolant thermostat, more or less
independent coolant inlets. coolant now flows through the radiator or directly to the coolant
Part of the coolant is fed simultaneously to the cylinder head, to pump. The temperature of the coolant in the coolant circuit is
the oil-water heat exchanger and to the exhaust gas recirculation regulated in this way. The coolant thermostat is controlled by the
actuator (Y27/9), the bypass housing and the exhaust gas CDI control unit via the coolant thermostat heating element.
recirculation cooler via the chain case housing. The temperature-dependent coolant level is adjusted by means of
The coolant flow of the oil-water heat exchanger is controlled by a the filling line between the coolant expansion reservoir and the
thermocouple depending on the engine oil temperature. radiator.
Part of the coolant is then fed via a coolant collector to the heat The cooling system is ventilated via a vent line between the
exchanger for the vehicle heating in the vehicle interior and the coolant expansion reservoir and the coolant collector.
other part to the coolant thermostat housing.
----------------------------------------------------------------------------------------- -----------------------------------------------------------------------------------------
- The limits stored in the CDI control unit for the intake air and
The coolant pump is switched off for a cold start for a maximum of coolant temperature as well as for the injected total fuel
500 s if the following conditions are fulfilled: quantities are still not reached.
- The engine speed or injection quantity has not exceeded its
established limit value.
- No "heating" was requested by the automatic air conditioning
control and operating unit (N22/7).
The coolant in the cooling system is brought into circulation by the When the coolant thermostat is in its closed state, the coolant
coolant pump. To allow the coolant to heat up more quickly in the flows to the coolant pump again and rejoins the circuit.
post-start phase, the coolant pump can be switched off by means When the operating temperature of the engine is reached, the
of the coolant pump switchover valve (Y133). The coolant pump coolant thermostat opens to switch in the radiator circuit, and the
switchover valve is actuated by the CDI control unit (N3/9). radiator then becomes part of the coolant circuit.
The coolant pump pumps the coolant into the crankcase via 2 Depending on the position of the coolant thermostat, more or less
independent coolant inlets. coolant now flows through the radiator or directly to the coolant
Part of the coolant is fed simultaneously to the cylinder head, to pump. The temperature of the coolant in the coolant circuit is
the oil-water heat exchanger and to the exhaust gas recirculation regulated in this way. The coolant thermostat is controlled by the
actuator (Y27/9), the bypass housing and the exhaust gas CDI control unit via the coolant thermostat heating element.
recirculation cooler via the chain case housing. The temperature-dependent coolant level is adjusted by means of
The coolant flow of the oil-water heat exchanger is controlled by a the filling line between the coolant expansion reservoir and the
thermocouple depending on the engine oil temperature. radiator.
Part of the coolant is then fed via a coolant collector to the heat The cooling system is ventilated via a vent line between the
exchanger for the vehicle heating in the vehicle interior and the coolant expansion reservoir and the coolant collector.
other part to the coolant thermostat housing.
----------------------------------------------------------------------------------------- -----------------------------------------------------------------------------------------
- The limits stored in the CDI control unit for the intake air and
The coolant pump is switched off for a cold start for a maximum of coolant temperature as well as for the injected total fuel
500 s if the following conditions are fulfilled: quantities are still not reached.
- The engine speed or injection quantity has not exceeded its
established limit value.
- No "heating" was requested by the automatic air conditioning
control and operating unit (N22/7).