What is the normal water temperature on a 318 v8?
190 deg f
The 1996 Mercury Gran Marquis does not have a 318 V8. It has a 281 V8 (4.6 Liter). 318 is a Chrysler engine. O2 sensors are located screwed into the exhaust system. Start at the exhaust manifold and go backward and you will find them. The cost varies from site to site. Ask you local Auto Parts store for a price quote.