Where is the thermostat located on a 1988 Mercury Grand Marquis 302?
The thermostat on A 5.0L grad marq with SEFI is found on the front of the motor, under a housing. Follow the upper radiator hose back, and itll be at the end of the run under a steel half-sphere. Unbolt the housing, loosen the hoses and be farwarned, its a tight squeeze.
What degree of thermostatic in a 1999 mercury grand marquis will work properly with the obd 2 system?
If the heater on a 1998 Mercury Grand Marquis keeps heating and does not shut down at the temperature you have selected is there a thermostat that you can change?
The thermostat gasket for a 1990 Mercury Grand Marquis is the standard "paper" type gasket, and a good RTV silicone is recommended. Permatex makes a sealant well-suited for the purpose - it's called "Water Pump and Thermostat Housing Sealant". You can also use similar sealants, such as Permatex Ultra Grey, Ultra Blue, or Ultra Black.