The question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library
To change the thermostat on a '98 Mercury Tracer LS, follow the radiator hose and remove the clamp on the thermostat housing. Remove the bolts, take out the thermostat, and replace with new.?æ?æ?æ
Get a manual on your car and it will have pictures and everything. It is not an easy job.
The dash must be completely removed in order to gain access to the heater box. Then the heater hoses are disconnected and the heater box is removed and opened up. That gains access to the heater core for relacement.
You carefully remove the top coolant hose to the heater, not totally off, just enough so air can get out.
Purchase a Hanes Auto Repair manual for the 1999 Mercury Tracer
Open the glove compartment and remove it. Disconnect the electrical connector and the three mounting screws. Remove motor.
3 screws facing the engine
Remove the belt from your Mercury alternator. Remove the wiring harness from the alternator. Remove the retaining bolts. Reverse the process to install your new alternator.
Begin by removing the retaining ring at the top of your 1996 Mercury Tracer ignition switch. The ignition lock cylinder will slide out. Remove the wiring harness from the end of the cylinder. Reverse the process to install your new ignition lock cylinder.
I take leaves and twigs out of the heater blower motor fan by remove four screws from a plastic housing under the glove compartment. The motor falls into your hands. PS the leaves and twigs make a heck of a noise - when you put the fan motor on.
Located in the fuel tank - may have to remove for access
To access a tie rod the Tracer needs to be safely raised and supported. Remove the wheels and lower ball joint. Mark and remove the outer tie rod. Install the new tie rod to the proper marking. Reinstall everything and take the car to receive an alignment.