A crack near or on the thermostat housing can cause a coolant leak in a 1996 Grand Marquis. The thermostat housing is located near the manifold on this vehicle.
To replace the heater core on a 1993 Mercury Grand Marquis, start by disconnecting the battery and draining the coolant from the radiator. Remove the dashboard and related components to access the heater core housing. Disconnect the hoses from the heater core, unbolt it from the housing, and replace it with the new unit. Finally, reassemble everything, refill the coolant, and check for leaks.
Your 1993 Grand Marquis may be overheating without the thermostat indicating a problem due to a faulty thermostat, a malfunctioning coolant temperature sensor, or low coolant levels. Additionally, a clogged radiator or a failing water pump could impede proper coolant circulation, causing overheating. It's essential to check for leaks, ensure the cooling system is filled with the correct coolant, and inspect for any obstructed hoses or components. If the issue persists, consider having a mechanic perform a thorough diagnostic.
what is it leaking? water, oil,coolant,or gas
lack of coolant, check for leaks.
The P1299 code on a 2007 Mercury Grand Marquis typically indicates an issue with the engine's cooling system, specifically related to the engine temperature sensor or the coolant temperature. To fix this, start by checking the coolant level and ensuring there are no leaks. Next, inspect the coolant temperature sensor and wiring for damage or corrosion; replacing the sensor may be necessary. Finally, if those components are functioning properly, consider checking the thermostat for proper operation and replace it if it is stuck closed or faulty.
To change the coolant temperature sensor on your 1998 Grand Marquis, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the sensor, which is typically found near the thermostat housing on the engine block. Remove the electrical connector, then unscrew the old sensor using a socket wrench. Install the new sensor, reconnect the electrical connector, and restore the battery connection before checking for leaks and ensuring proper operation.
better have the head gasket checked for leaks
change your antifreeze fill cap.
thermostat sticking or low oil or low coolant
You would pour it in the radiator. Caution, stop leaks usually clogs heater cores.
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
Diesel Grand Vitara engine problems can be caused by low-quality oil or coolant leaks. Fouled spark plugs can also cause the problems.