In a 50/50 mix, you’re looking at a mixture that can go down to nearly -50 degrees F before crystallization starts to occur. Many late-model cars and trucks use electric radiator fans. As a result, you can expect the temperature of … My coolant is filled TO THE BRIM and is not going down and my low coolant light is still coming on. Coolant Temperature Sensor. anywhere, no funky smell inside the cabin or coming out the exhaust pipe, no white smoke coming out the exhaust either. If it has it could be leaking coolant into the combustion chambers. Lack of adequate amount of coolant is solely responsible for the malfunctions in the cooling system of a car. Take note of the level the coolant reaches on the reservoir, then check again in a few days. They'll stick closed sometimes and not allow the coolant to circulate and drain from the reservoir thus causing the engine to overheat. Close. When the computer registers that the coolant temperature sensor reading has risen above a certain point, it turns on the radiator … OK, I have had fifty years of experience as a gear head working on cars and building high performance motors. If the coolant level is going down, and there is no external leak evident, then it's probably leaking internally, into the engine. Effective Antifreeze, Not Just Glycol Posted by 11 months ago. The coolant reservoir is the plastic reservoir mounted in the engine bay that stores the coolant for the engine. Possible signs of head gasket failure include: The radiator is a pressurized system so if there is a loss of pressure from the cap not fitting properly or if the cap is the incorrect cap for the radiator, the pressure will be lost and a leak could occur. Car does not overheat, even when operating in 100F+ air temperatures with the A/C running. To cycle the fans on and off, the computer relies on signals from the engine coolant temperature sensor mounted at the top of the engine. 12. Heater also works fine. In a similar way, it also boosts the boiling point of water, providing protection at both ends of the spectrum, and outperforming pure water when dealing with environmental extremes. This part is a simple fix usually and pretty cheap. Radiator cap leaks due to a faulty seal on the cap where the pressurized coolant can leak out Internal leaks where coolant may leak out of places such as the engine’s head gasket If you suspect that your vehicle has a coolant leak, visit a Firestone Complete Auto Care near you for a comprehensive system inspection. If the car has recently overheated then this could have caused the head gasket to fail. Coolant reservoirs are required because engines go through cycles of expelling and absorbing coolant as they warm up and cool down. 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