2003 FORD MUSTANG engine

5. Clean and inspect the thermostat mating surface at the engine.
6.
NOTE: The thermostat is indexed and must be returned to the original location.
NOTE: Coat the new thermostat gasket with gasket adhesive.
NOTE: Make sure the new O- ring gasket is secure around the thermostat.
To install, reverse the removal procedure.
7. Fill the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section. Klj . 2 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Thermostat —
4.6L(2V)
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Remove the bolts and coolant outlet connection.
3. Position aside the coolant outlet connection and the upper radiator hose.
4. Remove the thermostat and O- ring seal from the upper intake manifold.
z Inspect the O- ring seal. Install a new seal if necessary.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Thermostat —
4.6L(4V)
Removal and Installation 1. With the vehicle in neutral, position it on a hoist. For additional information, refer to Section 100 -
02 .
2. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
3. Remove the thermostat housing bolts.
4. Remove the coolant thermostat. 1. Separate the thermostat housing.
2. Remove the coolant thermostat and the O- ring seal.
z Inspect the O- ring seal. Install a new seal, if necessary.
5. NOTE: The thermostat is indexed and must be returned to the original location. NOTE: Make sure the new O - ring seal is secure around the thermostat. SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Bypass Tube —
3.8L
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Remove the upper intake manifold. For additional information, refer to Section 303 - 01A .
3. Remove the bypass hose from the bypass tube.
4. Remove the bolt and remove the bypass tube from the coolant pump.
5. Disconnect the quick connect fitting and remove the bracket bolts and the bypass tube.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

6. Install a new O-
ring seal on the coolant bypass tube.
7. CAUTION: Do not cut the O- ring seal during tube installation or engine coolant
leakage may occur.
Clean the O- ring sealing surface on the cylinder heads and lubricate the O- ring seal. Use
premium engine coolant.
8. To install, reverse the removal procedure. Klj . 2 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Bypass Tube —
Cobra
Removal and Installation 1. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
2. Disconnect the radiator upper hose and the radiator lower hose.
3. Remove the supercharger belt. For additional information, refer to Section 303 - 05 .
4. Disconnect the engine coolant temperature sensor electrical connector and unclip the wiring harness from the stud.
5. NOTE: LH is shown, RH is similar.
Remove the coolant bypass nuts.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

6.
NOTE: LH is shown, RH is similar.
Remove the bolts and the coolant bypass tube.
7. NOTE: Install new bypass tube O- rings and lubricate them, using premium engine coolant.
To install, reverse the removal procedure.
8. Fill and bleed the engine cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section. Klj . 2 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Bypass Tube —
Mach I
Removal and Installation 1. Remove the air intake scoop and bracket. For additional information, refer to Section 303 - 12 .
2. Drain the engine coolant. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section.
3. Disconnect the upper radiator hose from the bypass tube.
4. Disconnect the lower radiator hose. 5. Disconnect the engine temperature control (ECT) sensor electrical connector. SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Material
Item Specification
Motorcraft Premium Gold
Engine Coolant
VC
-7-A (in Oregon VC-7- B)
(yellow color) WSS-
M97B51-
A1 Klj . 1 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...