![]() A warning message might come up in many newer cars with a digital dash display. In some cars, this is a simple red light shaped like a thermometer floating in waves. When the temperature of the coolant gets over that threshold, the car’s computer will activate the engine coolant temperature warning. It’s usually set around 240 to 250 degrees, which is just below the point where the moving components inside the engine start to be at risk of overheating damage. Most automakers set a threshold for the safe operating temperature of the engine based on the temperature of the coolant that passes through the engine block. This information is then sent to the car’s computer to help it adjust the timing and other conditions needed for peak internal combustion performance. Why the Engine Coolant Temperature Warning MattersĪ lot of modern cars have an engine coolant temperature sensor that actively monitors the temperature of the coolant in the radiator. ![]() In this post, we’ll dig deeper into the common reasons why your engine temperature light might come on and, more crucially, what steps you should take when it does. So, when that little coolant temperature warning light pops on your dash while you’re driving, it’s essentially your car’s way of saying, “Hey, there’s something off with my cooling process, and I’m getting a bit too hot under the hood.” Continuing to drive while your coolant temperature warning light is on could lead to severe consequences, including potential engine overheating, damage to vital components, and, in extreme cases, a complete engine seizure. Managing this heat is the job of your vehicle’s cooling system, which uses a carefully concocted mixture of anti-freeze and water to absorb the engine’s heat before returning it to the radiator for dissipation. Internal combustion engines, the powerhouse behind most modern vehicles, create a huge amount of heat. But what exactly does this unsolicited red light mean, and more importantly, how should you respond? It’s the dreaded engine temperature light, casting a glow that’s as chilling as it is irritating. Flushing the coolant on a regular basis removes gunk and mineral deposits from your engine, while prolonging the life of your heater core, thermostat, hoses and water pump.We’ve all been there: cruising down the highway, belting out our favorite tune, when suddenly – an unexpected thermometer or simply the word “TEMP” or a more alarming ‘ENGINE OVERHEATING’ illuminates on the dashboard. If you spill coolant when you flush your Mustang, be sure to put down cat litter to soak it up to discard it. The video above shows you where the petcock on your radiator is located, how to flush the coolant / antifreeze and how to burp the system to get the air out of your Mustang.Ĭoolant is toxic and animals are attracted to the sweet taste of coolant (antifreeze). When you flush your coolant, which is antifreeze, on your 1991, you are draining out all of the old dirty coolant and preventing costly radiator and cooling system repair down the road. Like the oil in your Mustang, coolant gets dirty over time and loses its ability to cool down your 5.0 liter engine. Turn off the engine and drain the water, fill up the radiator with antifreeze until you have a 50/50 coolant / distilled water mixture and burp the system. Fill up the radiator with distilled water and run the engine. This video shows where the radiator drain plug (petcock) is located on a 1991 Ford Mustang. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. ![]() In addition to preventing your car from overheating, coolant / antifreeze also helps lubricate the seals in the water pump and hoses. Coolant / antifreeze also passes through the heater core under your cowl to provide heat to the cabin of your Mustang. Coolant / antifreeze circulates through Mustang radiator and engine to maintain the proper temperature. ![]() Learn how to flush the coolant (antifreeze) in your 1991 Ford Mustang.
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