You don't repair a muffler, you REPLACE it.
If there is a rotted hole in the muffler please replace the muffler. However, if there is a small hole at the bottom end of the muffler it is there to allow water to escape.
Muffler bearing do not exist.
In the fuel tank.
There is a circuit breaker thaich could be bad.
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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.
blown head gasket much?
www.autozone.com
This is for COLT FIREARMS, not automobiles.
A repair manual
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.