There are 2; one on each side of the intake manifold toward the front. See pics and description here...
http://www.autoclinix.com/Manifold3.htm
Location of coolant temperature sensor on a 2003 Mercury Grand Marquis?Read more: Location_of_coolant_temperature_sensor_on_a_2003_Mercury_Grand_Marquis
Its in the air cleaner lid towards the rear.
on the transmission
The temperature sensor is on the right hand side of you digital A/C controler it is the little round vent holes on the side of the a/c controls
Mercury Grand Marquis was created in 1983.
The 2003 Mercury Grand Marquis came equipped with the 4. 6L V8. Oxygen (O2) sensor locations are upstream and downstream (before and after the catalytic converters).
On a 1998 Mercury Grand Marquis : Bank 2 is the drivers side of the engine Sensor 1 would be in the exhaust close to the engine before the exhaust enters the catalytic converter ( upstream sensor )
next to the crank pulley
On a 1999 Mercury Grand Marquis : The Mass Air Flow Sensor should be between the engine air filter and the big engine air intake tube
On a 1996 Mercury Grand Marquis , 4.6 liter V8 engine : Bank 1 is the passenger side of the engine Sensor 2 would be AFTER the exhaust has passed through the catalytic converter
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