![Ford Thunderbird Manual Download Page 215](http://html.mh-extra.com/html/ford/thunderbird/thunderbird_manual_2318585215.webp)
03-03-5
Engine Cooling
03-03-5
DESCRIPTION AND OPERATION (Continued)
Radiator-4.6L Engine Shown, 3.8L Engine Similar
Cooling Fan, Electric
The cooling fan system consists of a fan blade
(8600)
and a two-speed cooling fan motor attached to a fan
shroud
(8 146)
located behind the radiator
(8005).
The cooling fan motor is wired to operate only when
the ignition switch is in the ON position. This prevents
the cooling fan motor from operating after the ignition
switch is turned to the
OFF
position. The cooling fan
motor is serviced only as an assembly with the fan
blade and the fan shroud.
Thermostat, Water
The water thermostat
(8575)
operates as follows:
•
When coolant is cold, the water thermostat is in the
closed position and engine coolant flow is restricted
to the cylinder blocks
(60 1 0),
cylinder head
(6049),
intake manifold
(9424)
and heater core
( 18476).
•
As temperature increases, the water thermostat
opens and a portion of the coolant is allowed to
pass into the radiator
(8005).
Constant Control Relay Module
INLET
TANK
03279-8
WARNING: DISCONNECT THE COOLING FAN
MOTOR PRIOR TO PERFORMING ANY
UNDERHOOD SERVICE SINCE THE COOLING FAN
MOTOR COULD CYCLE IF THE IGNITION SWITCH
IS LEFT IN THE ON POSITION EVEN THOUGH THE
ENGINE IS NOT RUNNING.
NOTE: Cooling fan motor will not cycle with
A I C
clutch
(2884).
The cooling fan motor will come
on
when
A I C
switch is turned ON.
The cooling fan motor is controlled during vehicle
operation by the constant control relay module
(CCRM)( 1 2B581 )
and powertrain control module
(PCM)( 1 2A650),
which will energize the cooling fan
motor under the following conditions:
Cooling fan motor will run at low speed:
•
if engine temperature is higher than normal. Cooling
fan motor starts running at
1 06°C (222°F)
and
stops running at
1 0 1
oc
(2 1 4 °F).
•
if
A I C
is on and vehicle speed does not provide
enough natural airflow. Cooling fan motor starts
running at speeds at or below
69
km
I
h
(43
mph)
and stops running at
77
km l h
(48
mph).
Cooling fan motor will run at high speed:
•
if engine temperature is higher than desirable and
cooling fan motor has been operating at a low
speed.
•
at
109°C (228°F)
and stops running at
105°C
(220°F).
1997 Thunderbird, Cougar July 1 996