![]() When a thermostat fails it will either stop the coolant flow at operating temperature "stick closed" or fail to stop the coolant flow causing the engine to run colder longer than necessary.  The operating temperature of 190 °-210 ° F is used to help facilitate fuel combustion. This temperature sensitive valve is designed to open when the engine has reached operating temperature (190 °-198 ° F).  An engine thermostat is designed to stop the flow of coolant from the engine to the radiator. After necessary repairs have been made refill the cooling system with manufacturers recommended engine coolant and recheck operation. If coolant is present the heater core has failed and must be replaced or repaired. Next, the car heater core must be inspected the quickest way to check the heater core condition without removal the heater core is to inspect the passenger's side foot well compartment carpet for the presents of coolant. To inspect engine gaskets disassembly is required. With the engine off remove the engine oil fill cap and turn it over, if a milky oil condensation is present the engine may have a failed cylinder head or intake manifold gasket allowing coolant to leak internally. If no coolant is observed two additional checks are needed for a complete test. Start engine and allow to run for about three to five minutes (do not allow to overheat) while the engine is running inspect the ground below the engine, if an engine coolant leak is present observe the location of the coolant drops, this will help determine where to start looking for the coolant leak (shut the engine off before inspecting). Remove the radiator cap and carefully (do not spill) add water until full, then re-install cap. To test for an engine coolant leak move the car to a dry smooth surface and allow the engine to cool. This heat expansion forces coolant out of the radiator and coolant reservoir. If engine over heating has occurred the coolant level will naturally be low due to expansion to the coolant from the extreme heat of the engine. If the coolant level is not between the reservoir marks the cooling system may have a leak. Always check the coolant level when the engine is cold, preferably over night. Inspect the engine coolant level in the coolant reservoir tank coolant level should be between the hot and cold marks.  Engine coolant is used to transfer heat from the engine to the radiator if a coolant leak is present the engine will eventually overheat. "  Check Engine Coolant Level - Test For Leaks. (Always inspect engine cold to avoid personal injury) (note: coolant and antifreeze refer to the same product, in below freezing, coolant lowers the freeze point hence the name anti-freeze and inn warm weather coolant help raise the boiling point, "coolant") Coolant leaks are a common car problem that can lead to overheating we have listed some of the most popular causes below.  Engine coolant colors can vary from green, orange, blue and yellow each having their own unique protective and environmental properties. Without coolant your engine will over heat and if left unattended sever engine damage will occur.  The radiator removes heat from the coolant by forcing air through the radiator cooling fins. Engine coolant is used to transfer heat from the engine to the radiator by the cooling system. A cooling system consists of a water pump, thermostat, radiator hose, hose clamps, radiator, radiator cap and coolant. These high temperatures are controlled with the help of the cooling system. These explosions are converted into power through the engine while producing a large amount of heat. Spark plugs are used to ignite the fuel / air mixture contained in the cylinders. Inside your car's engine, thousands of controlled explosions called combustion events caused by igniting a fuel / air mixture inside the engine. Start by replacing the thermostat see below infoĬar Engine Over Heating - Troubleshooting
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