Where is the electric auxiliary coolant pump located?
The auxiliary water pump is typically located at the rear of your engine, where the main water line splits to supply the heater core with recently heated coolant.
What is the auxiliary pump used for?
The function of an auxiliary water pump Its primary use is circulating water by way of a bypass hose from the main coolant lines to a heater core. The heater core is used to collect heat and distribute warm air into your vehicle when the heater is turned on.
What do you need to know about auxiliary coolant pump?
The tools needed to diagnose an auxiliary coolant pump include: scan tool, meter and service information, with scan tools and service information being most important for late-model vehicles. The operation of the pump is dependent on several modules and numerous sensors that are networked.
What to do if your auxiliary water pump is inoperative?
If the auxiliary coolant pump is inoperative, the customer might notice reduced heater performance at low speeds and at idle. Your first instinct might be to replace the thermostat, the water pump or the heater core, but if the vehicle is equipped with an auxiliary coolant pump, you will need to dig a little bit deeper with your diagnostic process.
When did Mercedes Benz start using auxiliary coolant?
Keep in mind, most Mercedes Benz vehicles made after 1999 have these auxiliary coolant pumps, this includes everything from the C-Class to the S-Class. If you think there is a problem, you not only have to troubleshoot the pump but the system that controls it. We were unable to load Disqus.
What do you call an auxiliary cooling circuit?
The cooling circuit on some vehicles with electric pumps may be called an auxiliary cooling circuit in the service information. The coolant may travel through the transmission cooler and windshield washer fluid bottle as part of the circuit on some Mercedes models.