The thermostat on a 1991 Mercury Topaz is typically located on the engine block, near the intake manifold. To access it, you'll generally need to remove the upper radiator hose and the thermostat housing, which is usually secured by bolts. Once you remove the housing, you should see the thermostat seated in a recess in the engine. Always consult a repair manual for specific instructions related to your vehicle model.
where is the thermostat
follow the upper radiator hose to the thermostat housing
Follow top rad. hose. It's in that housing.
the thermostat is underneath the manifold, follow the top radiator hose and unbolt the manifold. fairly simple.
Just follow the top rad hose. It's in the housing.
To change the thermostat on a Mercury Topaz, first ensure the engine is cool, then disconnect the negative battery cable. Drain the coolant and remove the thermostat housing, which is typically held in place by bolts. Take out the old thermostat, clean the mating surfaces, and install the new thermostat along with a new gasket. Finally, reassemble the housing, refill the coolant, and reconnect the battery.
There is a circuit breaker thaich could be bad.
Look at your radiator. Find the upper hose. Follow it towards the engine. At the end will be your thermostat housing. Guess whats inside?
Mercury Topaz was created in 1983.
If you fallow the rad hose off the top of rad there will be a body that the hose is clamped on to at the motor it will be under there
If you are replacing the brake lines ( metal ) then just use your better judgment. They do not have to follow the original route.
Call your local wrecking yard as they have crossover books.