Engine coolant flushes are an essential part of maintaining the health of your vehicle's cooling system. One symptom that indicates the need for a coolant flush is when the engine starts to overheat. If the temperature gauge rises above the normal range or if steam is coming from under the hood, it is likely that the coolant needs to be flushed. Another symptom is a sweet smell coming from the engine, which can indicate a coolant leak. Additionally, if the coolant appears rusty or has sediment in it, a flush is necessary. This can be caused by a buildup of dirt, debris, and sediment in the coolant system, hindering its ability to regulate the engine's temperature effectively. Another sign is when the coolant appears rusty or discolored, indicating contamination.

The frequency of coolant flushes depends on the manufacturer's recommendation, but generally, it is recommended to have a coolant flush every 30,000 to 50,000 miles or every 2 to 3 years. However, if you frequently drive in extreme conditions or your vehicle is older, it may be necessary to have more frequent coolant flushes.