the library should have a shop manual for this vehicle, you can make copies of the right sections :)
it is right across from my thermostat and i have a 2000 mercury cougur it srews in and out.
The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap on a 1999 Mercury Mystique
"COOLANT THERMOSTAT" -COOLANT TEMP BELOW THERMOSTAT TEMPERATURE
The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.
A little more information please . What year , four cylinder or V6 , automatic or manual transmission . Then someone can probably answer your question about the coolant system capacity of a Mercury Mystique . Thanks ( also might need to know if it has air conditioning )
The temperature of the coolant entering the heater core is controlled by the engine thermostat. The engine coolant thermostat is generally located at the engine end of the upper radiator hose.
Is it leaking from the side by the coolant reservoir?
Low coolant? Bad thermostat? Heater core restricted, plugged or airbound? Temperature control not working? Water pump not circulating coolant?
The thermostat in a car regulates the coolant temperature inside the engine. When the engine is cold, the thermostat is closed, allowing the heat from the combustion chamber to heat the fluid (coolant) in the coolant galleys in the engine block. Once the engine reaches an optimal temperature, the thermostat opens, allowing coolant to flow through the radiator. The thermostat then controls the flow of coolant to hold the engine at its optimum operating temperature, irrespective of engine load and operating condtions.
i have a 1999 cougar mercury vehicle that all of a sudden doesn't reverse.Why?
cougar 99 where is coolant temperature sensor
That would be the thermostat.