What is the reason for the open circuit of coolant pump 2?

[AngeloFitz]

The open circuit of coolant pump 2 means that there is a fault with a coolant pump, which needs to be checked or replaced. Coolant pump 2 is an auxiliary water pump located not far from the main water pump, used for continuous heat dissipation after the car is turned off. Check the wiring harness and the small water pump. It is necessary to go to a 4S shop for inspection and repair. Extended information: Wiring harness: The wiring harness is directly connected to the engine computer through a plug without a fuse. The water pump of this car is installed under the intake pipe. It is located at the interface between the engine and the transmission, below the intake pipe. Replacing the water pump requires removing the intake pipe. Coolant: Coolant is an indispensable part of a car engine. It circulates in the engine cooling system, carrying away excess heat generated during engine operation, allowing the engine to operate at normal working temperature. When the coolant is insufficient, it will cause the engine water temperature to be too high, leading to damage to engine components. Therefore, once the owner finds that the coolant is insufficient, it should be added in time.

[SanAnthony]

I've encountered situations where the coolant pump circuit was open, usually caused by aging or damaged wiring, especially in older vehicles where the wiring can become burnt or cracked under the high temperatures of the engine, leading to an open circuit. Another common cause is loose or corroded electrical connections, such as oxidized terminals, resulting in poor contact and preventing current from flowing smoothly. It could also be a blown fuse—if the cooling system is overloaded or short-circuited, the fuse will trip and cut off the circuit. Additionally, control module failures can cause issues, like sensor malfunctions or stuck relays, affecting the pump's power supply. Any of these reasons can cause the pump to stop working, leading to engine overheating. If detected, it's best to inspect the entire electrical system as soon as possible to avoid being stranded on the road.

[VanReagan]

Last time my car had a coolant pump circuit failure, which really scared me. In fact, the root cause often lies in improper maintenance. Not changing the coolant for a long time or using inferior quality fluid can cause corrosion, damaging the wiring or components near the pump. Additionally, frequently driving through water or in salt fog areas can lead to dampness and rust in the wiring, causing an open circuit. There are also risks from improper modifications, such as unauthorized installation of electronic devices leading to unstable current, which can burn out the pump's wiring. More importantly, this issue is very dangerous. Once the pump stops, the cooling system fails, and the engine can overheat and be ruined within minutes. Not only are the repair costs high, but it also poses a safety risk. It's recommended to stop by the roadside and seek assistance immediately if any problem arises.

[StMaverick]

I guess you might be experiencing a coolant pump open circuit. Here are a few simple DIY checks: First, inspect the fuse box for any signs of blown fuses, typically the ones related to the cooling system. Then, check if the pump's connector is loose or dirty—unplug it, clean it, and reconnect it firmly. If you notice any burnt smell or damage on the wiring, that might be the open circuit point. Also, make sure the coolant level is adequate, as low fluid can cause the pump to run dry, accelerating wear and leading to an open circuit. These are basic preliminary checks any car owner can perform. While simple, don’t underestimate them. If you can’t fix it, don’t tamper further—head to a repair shop without delay.