What does Audi coolant pump 2 open circuit mean?
2 Answers
Audi coolant pump 2 open circuit means there is a fault with a coolant pump that requires inspection or replacement. 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 needs to be inspected and repaired at a 4S shop. Additional information: 1. Wiring harness: The wiring harness is directly connected to the engine computer via a plug without a fuse. The water pump of this car is installed under the intake pipe, at the junction of the engine and transmission. Replacing the water pump requires removing the intake pipe. 2. Coolant: Coolant is an essential 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 rise too high, leading to engine component damage. Therefore, once the owner finds the coolant is insufficient, it should be replenished promptly.
On an Audi vehicle, a "Coolant Pump 2 Open Circuit" means that the electrical circuit of that pump is broken, similar to a wire being disconnected in the middle, preventing current from flowing and causing the water pump to fail to operate. This issue is typically caused by a blown fuse, aging wiring, or loose connections. If this occurs, the coolant circulation will deteriorate, potentially leading to engine overheating, and in severe cases, it may trigger a warning light or cause more significant damage. From my experience, when such a warning appears, don’t delay—immediately check the fuse box and connections. However, avoid attempting repairs without the right tools, as this can lead to mistakes. It’s best to seek professional repair services when needed to avoid additional costs. For prevention, regularly inspect the insulation of wiring to prevent moisture corrosion.
