Why doesn't it start?

All what suggestions?

REMOVAL & INSTALLATION

2.0L Engine
See Figures 1 through 6

Fig. 1: Remove the coolant recovery tank hose from the water outlet

Fig. 2: Remove the upper radiator hose from the water outlet

Fig. 3: Remove the three retaining bolts for the water outlet

Fig. 4: Carefully separate the water outlet from the thermostat housing

Fig. 5: Remove the thermostat from the housing

Fig. 6: Make sure you replace the O-ring when installing a new thermostat

1. Disconnect the negative battery cable.
2. Drain and recycle the engine coolant.
3. Remove the air intake resonators.
4. emove the upper radiator hose and coolant recovery tank hose from the water outlet.
5. Remove the three retaining bolts from the water outlet and remove the outlet from the thermostat housing.
6. Remove the thermostat and O-ring from the housing.
   

To install:

1. Thoroughly clean the housing and install the thermostat and new O-ring into the housing.
2. Install the water outlet and tighten the retaining bolts to 71-97 inch lbs. (8-11 Nm).
3. Install the upper radiator and coolant recovery tank hoses to the water outlet.
4. Install the air intake resonators.
5. Connect the negative battery cable.
6. Fill the cooling system with the proper 50 / 50 mixture and start the vehicle.
7. Bleed the cooling system and check for leaks.

Hope this helps (remember to rate and comment this asnwer).

Check this procedure for 1995 Ford Contour 2.0L MFI DOHC 4cyl...

REMOVAL & INSTALLATION
2.0L Engine (see Figures 1 through 6)

Fig. 1: Remove the coolant recovery tank hose from the water outlet

Fig. 2: Remove the upper radiator hose from the water outlet

Fig. 3: Remove the three retaining bolts for the water outlet

Fig. 4: Carefully separate the water outlet from the thermostat housing

Fig. 5: Remove the thermostat from the housing

Fig. 6: Make sure you replace the O-ring when installing a new thermostat

I hope this helps top solve it (remember comment and to rate this answer). Good luck.

DRAIN COOLANT LEVEL DOWN BELOW THERMOSTAT.PLACE DRAIN PAN UNDER VECHICLE TO CATCH ANTIFREEZE.WHEN DONE PUT ANTIFREEZE SAFE PLACE FROM KIDS AND ANIMALS.WHEN DONE DRAINING SOME ANTIFREEZE.FOLLOW RADIATOR HOSE TO TOP OF INTAKE TO THERMOSTAT HOUSING. LOOSEN HOSE CLAMP REMOVE RADIATOR HOSE FROM THERMOSTAT HOUSING.THEN LOOSEN HOUSING BOLTS.REMOVE THERMOSTAT HOUSING AND THERMOSTAT.CLEAN BOTH THE THERMOSTAT HOUSING SURFACE AND INTAKE SURFACE YOU CAN USE ACETATE OR BRAKE CLEANER AND SCOTCH BRITES ROLL OF CLEAN PAPER TOWEL. AFTER CLEANING HOUSING AND INTAKE SURFACE MAKE SURFACE CLEAN SMOOTH FROM THE DEBRIS WHEN DONE. TAKE THERMOSTAT PUT GASKET SEALER ON BOTH SIDES OF GASKET PUT GASKET TO THERMOSTAT HOUSING MAKE SURE GASKET AND THERMOSTAT HOUSING HOLES ALIGN CORRECTLY.NOW PLACE NEW THERMOSTAT IN PLACE IN THE INTAKE.MAKE SURE THERMOSTAT SPRING END GOES TOWARD ENGINE FACING DOWN.THEN INSTALL THERMOSTAT HOUSING WITH GASKET TO THE INTAKE.TORQUE THERMOSTAT HOUSING BOLTS TO 20 FT LBS.WAIT 1 HOUR BEFORE POURING ANTIFREEZE BACK IN THE COOLANT SYSTEM GIVE THERMOSTAT GASKET SEALER LITTLE TIME TO CURE.SO YOU WONT HAVE COOLANT LEAKS.NOW IF THERMOSTAT HAS THE LARGE O- RING ON IT YOU DONT HAVE A THERMOSTAT HOUSING GASKET THE THERMOSTAT O- RING IS THE SEAL THAT HOLDS COOLANT INSTEAD OF GASKET.WHEN THERMOSTAT AND HOUSING IN PLACE.INSTALL RADIATOR HOSE TO THERMOSTAT HOUSING TIGHTEN HOSE CLAMP.THEN FILL RADIATOR BACK UP WITH THE COOLANT YOU DRAIN OUT.START VECHICLE UP. THEN CHECK FOR LEAKS.

See below. I also recommend you read my post at http://www.fixya.com/cars/r5929960-s_thermostat and let me know if you have any questions.

1. Drain the cooling system.
   

CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

1. Some models require you to remove the air cleaner assembly from the throttle body.
2. Some models with cruise control have a vacuum modulator attached to the thermostat housing with a bracket. It your vehicle is equipped as such, remove the bracket from the housing.
3. On the 4-cylinder engines, unbolt the water outlet from the thermostat housing, remove the outlet from the housing and lift the thermostat out of the housing. On all other models, unbolt the water outlet from the intake manifold, remove the outlet and lift the thermostat out of the manifold.

Fig. Fig. 1: Loosen the clamp securing the hose to the thermostat housing

Fig. Fig. 2: Remove the bolts securing the housing, then pull it away
To install:

1. Clean both of the mating surfaces and run a 1 / 8 in. (3mm) bead of R.T.V. (Room Temperature Vulcanizing) sealer in the groove of the water outlet.

1. Install the thermostat (spring towards engine) and bolt the water outlet into place while the R.T.V. sealer is still wet. Tighten the bolts 17-21 ft. lbs. (23-28 Nm) on all but the 2.2L engine. Other engines tighten to 89 inch lbs. (10 Nm).
2. The remainder of the installation is the reverse of removal. Fill the cooling system, start the engine and top off. Check for leaks after the car is started and correct as required.

Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat .

Specific instructions for your car are as follows. Let me know if you get stuck or have more questions.

Removal & Installation

4.2L Engine

1. Remove the necessary coolant from the radiator.
2. Remove the alternator, as outlined in the Engine Electrical Section.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
   

To install:

1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts and tighten to 89 inch lbs. (10 Nm).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the alternator.
6. Fill the cooling system with specified coolant and concentration.
7. Inspect all sealing surfaces for leaks after starting the engine.

5.3L Engine
NOTE The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.

1. Drain the cooling system to a level below the thermostat.
2. Remove the radiator outlet hose.
3. Remove the water pump inlet bolts.
4. Remove the water pump inlet and thermostat from the water pump.

To install:

1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts. Tighten the bolts to 11 ft. lbs. (15 Nm).
3. Install the radiator outlet hose.
4. Properly fill the engine cooling system and check for leaks.

1. Disconnect the negative battery cable.
2. Drain the cooling system.

CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

1. Some models require you to remove the air cleaner assembly from the throttle body.
2. Some models with cruise control have a vacuum modulator attached to the thermostat housing with a bracket. It your vehicle is equipped as such, remove the bracket from the housing.
3. On the 4-cylinder engines, unbolt the water outlet from the thermostat housing, remove the outlet from the housing and lift the thermostat out of the housing. On all other models, unbolt the water outlet from the intake manifold, remove the outlet and lift the thermostat out of the manifold.

To install:

1. Clean both of the mating surfaces and run a 1 / 8 in. (3mm) bead of R.T.V. (Room Temperature Vulcanizing) sealer in the groove of the water outlet.

1. Install the thermostat (spring towards engine) and bolt the water outlet into place while the R.T.V. sealer is still wet. Tighten the bolts 17-21 ft. lbs. (23-28 Nm) on all but the 2.2L engine. Other engines tighten to 89 inch lbs. (10 Nm).
2. The remainder of the installation is the reverse of removal. Fill the cooling system, start the engine and top off. Check for leaks after the car is started and correct as required.

It Depends on which engine you have, this is how it goes for both. I use a little RTV with a new ring as well.

THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure
1. Remove the necessary coolant from the radiator.
2. Remove the generator.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
Installation Procedure
1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts.
Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the generator.
6. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
7. Inspect all sealing surfaces for leaks after starting the engine.
THERMOSTAT REPLACEMENT (5.3L ENGINE)
1. Drain Radiator and remove the radiator outlet hose.
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure
IMPORTANT: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts.15 N.m
3. Install the radiator outlet hose.
4. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
5. Inspect all sealing surfaces for leaks after starting the engine.

3.6L Engine

1. Remove the heater hoses.
   
2. Remove the throttle body.
   
3. Remove the radiator water pipe outlet.
   
4. Remove the thermostat and housing.
   
   NOTE The thermostat and housing are replaced as a complete unit.
   
   
5. To install, reverse the removal procedure. Tighten the housing bolts to 15 ft. lbs. (20 Nm).
   

3.8L Engine

1. Remove the fuel injector sight shield.
   
2. Partially drain the cooling system.
   
3. Remove the radiator inlet hose from the water outlet housing.
   
4. Reposition the wiring harness from the water outlet housing stud.
   
5. Remove the water outlet housing bolt and the stud.
   
6. Remove the water outlet housing and the gasket.
   
7. Remove the thermostat.
   
8. Clean and Inspect the water outlet housing gasket mating surfaces.
   

To install:

1. Install the thermostat.
   
2. Install the gasket and the water outlet housing.
   
3. Install the water outlet housing bolt and the stud to the water outlet housing and tighten to 20 ft. lbs. (27 Nm).
   
4. Install the wiring harness to the water outlet housing stud.
   
5. Install the radiator inlet hose to the water outlet housing.
   
6. Fill the cooling system.
   
7. Install the fuel injector sight shield.
   

1. Disconnect the negative battery cable.
2. Drain the cooling system.

CAUTIONWhendraining the coolant, keep in mind that cats and dogs are attracted byethylene glycol antifreeze, and are quite likely to drink any that isleft in an uncovered container or in puddles on the ground. This willprove fatal in sufficient quantity. Always drain the coolant into asealable container. Coolant should be reused unless it is contaminatedor several years old.

1. Some models require you to remove the air cleaner assembly from the throttle body.
2. Somemodels with cruise control have a vacuum modulator attached to thethermostat housing with a bracket. It your vehicle is equipped as such,remove the bracket from the housing.
3. On the 4-cylinder engines,unbolt the water outlet from the thermostat housing, remove the outletfrom the housing and lift the thermostat out of the housing. On allother models, unbolt the water outlet from the intake manifold, removethe outlet and lift the thermostat out of the manifold.

Fig. 1: Loosen the clamp securing the hose to the thermostat housing Fig. 2: Remove the bolts securing the housing, then pull it away Fig. 3: Make a note as to which end of the thermostat fits in the housingTo install:

1. Clean both of the mating surfaces and run a 1/8 in. (3mm) bead of R.T.V. (Room Temperature Vulcanizing) sealer in the groove of the water outlet.

Fig. 4: Make sure both of the mating surfaces are free of any old gasket material

1. Installthe thermostat (spring towards engine) and bolt the water outlet intoplace while the R.T.V. sealer is still wet. Tighten the bolts 17-21 ft.lbs. (23-28 Nm) on all but the 2.2L engine. Other engines tighten to 89inch lbs. (10 Nm).
2. The remainder of the installation is thereverse of removal. Fill the cooling system, start the engine and topoff. Check for leaks after the car is started and correct as required.