Ford 2003 Mustang Workshop Manual page 1849

B5 CHECK THE COOLING FAN OPERATION
Carry out the cooling fan component tests. Go to Component
Tests.
Is the cooling fan operation OK?
PINPOINT TEST C: THE ENGINE DOES NOT REACH NORMAL
OPERATING TEMPERATURE
Test Step
C1 CHECK THE ENGINE
TEMPERATURE
Start the engine and allow the
engine to idle for ten minutes.
Feel the inlet and heater water
hoses and the underside of the
upper radiator hose.
Are the upper radiator hose
and the heater water hoses
cold?
Component Tests
Pressure Test — 3.8L
WARNING: Never remove the pressure relief cap while the engine is operating or when the
cooling system is hot. Failure to follow these instructions can result in damage to the cooling
system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of
the degas bottle when removing the pressure relief cap, wait until the engine is cooled, then
wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the
pressure is released from the cooling system. When you are sure all the pressure has been
released, turn and remove the pressure relief cap (still with a cloth).
1. Remove the radiator cap. Fill the radiator as needed. Fit the pressure tester to the radiator neck,
using an aftermarket adapter.
2. CAUTION: Do not pressurize the cooling system beyond 110 kPa (16 psi).
Pump the cooling system to a maximum of 102 kPa (14.9 psi) and hold for 2 minutes. If the
pressure drops within this time, inspect for leaks and repair as necessary.
Pressure Test — 4.6L
Result / Action to Take
Yes
INSTALL a new water thermostat. REFER to
Thermostat—3.8L , Thermostat—4.6L(2V)
Thermostat—4.6L(4V)
for normal operation.
No
For diagnosis and testing of the engine coolant
temperature gauge, REFER to
Yes
For diagnosis and
testing of the engine,
REFER to
00 .
No
INSTALL a new fan
component as
necessary. TEST the
system for normal
operation.
or
in this section. TEST the system
Section 413-01
Section 303-
.