Air bubbles can get trapped in vehicle coolant systems, making them less efficient. If your engine is running hot, you might want to try burping your coolant. The basic process involves mixing coolant with water, adding it to your system, and running the engine with the radiator cap off. When you notice the coolant level drop, you can turn off the car, refill the system, put the cap back on. If it takes more than a few minutes, keep an eye on the engine temperature to make sure it doesn't overheat.
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