Question about 2000 Dodge Durango
engine over heat or run hot?
Bear in mind that any air (as well as gunk) trapped in the coolantlines will cause overheating, particularly higher up around the headgasket. This overheating can definitely cause warping and result in ablown gasket. This is especially common in cars with aluminum headgaskets. (I don't know how the Cougar was designed.) Always "burp" yourcoolant system after flushing.
Engine coolant is used to transfer heat from the engine to the radiator; if a coolant leak is present the engine will eventually overheat. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the engine is cold, preferably over night. If the coolant level is not between the reservoir marks the cooling system may have a leak. - Engine Coolant Leaks
If engine overheating has occurred the coolant level will naturally be low due to expansion of the coolant from the extreme heat of the engine. This heat expansion forces coolant out of the radiator and coolant reservoir. To test for an engine coolant leak move the car to a dry smooth surface and allow the engine to cool. Remove the radiator cap and carefully (do not spill) add water until full, then re-install cap. 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).
If no coolant is observed two additional checks are needed for a complete test. 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. To inspect engine gaskets disassembly is required. 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 presences of coolant. If coolant is present the heater core has failed and must be replaced or repaired. After necessary repairs have been made refill the cooling system with manufacturers recommended engine coolant and recheck operation
An engine thermostat is designed to regulate the flow of coolant from the engine to the radiator. This temperature sensitive valve is designed to open when the engine has reached operating temperature (190°-198° F). The operating temperature of 190°-210° F is used to help facilitate fuel combustion. When a thermostat fails it will either stop the coolant flow "stick closed" and overheat or fail to stop the coolant flow causing the engine to run colder longer than necessary. If the thermostat fails to "close" it will cause the coolant to continuously flow through the engine creating a diagnostic trouble code (check engine light) to be set. When a thermostat sticks closed it will cause the engine to overheat quickly, usually within 5 to 15 minutes of operation. To check for either of these conditions drain coolant and remove thermostat, (thermostat is located in the thermostat housing) if you are unsure of the location of the thermostat on your engine consult a car repair manual. Once you have removed the thermostat inspect the condition of the main body check for any cranks or broken pieces, also check the valve to make sure it is closed. If the valve is open the thermostat has failed and needs to be replaced. To check the operation of the thermostat prepare a pot of water on the stove top deep enough to cover the thermostat completely. Install the thermostat in the pot of water, turn the stove on a medium/high flame, the thermostat should open right before the water comes to a boil. If the water has boiled and the thermostat valve is still closed the thermostat has failed and needs to be placed.
Posted on Jun 16, 2009
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Posted on Jan 02, 2017
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