What does auxiliary coolant pump do?
An auxiliary water pump is different than a single water pump in that it is an electrically controlled motor. Its primary use is circulating water by way of a bypass hose from the main coolant lines to a heater core that is used to collect heat and distribute warm air into your vehicle when the heater is turned on.
What control module controls the auxiliary coolant pump?
The BCM or controlling module will control and regulate the pump using information like: Vehicle speed. Engine RPM.
What is an after run coolant pump?
These lines are fed by the oil pump and the water pumps respectively when the engine is running. To help maintain the life of the turbo, there is also an auxilliary after-run pump to recirculate the coolant through the engine and turbo after the engine is shut off.
Why do I smell coolant after driving?
THE CULPRIT: Coolant containing sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. It might be coming from a leaky radiator cap or the radiator itself, especially if you smell it outside the car. A strong odor inside the passenger compartment probably means a bad heater core.
Why did Mercedes use an auxiliary coolant pump?
So, adding an auxiliary coolant pump would provide enough coolant to keep the heater core warm. Mercedes then started to use these pumps on gasoline-powered vehicles like the C- and S-Class for the same purpose allowing vehicle engineers to use larger heater cores to provide better passenger comfort.
Is the cambelt driven water pump the auxiliary coolant pump?
As far as I am aware the auxiliary pump maintains an adequate flow of coolant through the heater matrix at all engine speeds to enable consistent heater output. The cambelt driven water pump is the critical one. Someone correct me if this isn’t the case?..
What happens if an auxiliary coolant pump fails?
A failed pump will almost never cause the vehicle to overheat. If the auxiliary coolant pump is inoperative, the customer might notice reduced heater performance at low speeds and at idle.
Why are auxiliary water pumps used in diesel engines?
Its primary function is to circulate warm coolant to the heater core. If too little coolant is circulated, the blower fan will pull enough heat out of the coolant and cause the heater core to get cold. These pumps were first used on diesel vehicles in the 1980’s because most diesel engines do not generate a lot of heat when running or idling.