RADIATOR FAN OPERATION—3.2/3.5L ENGINES
ENGINE COOLANT TEMPERATURE
INTAKE (CHARGE) AIR
TEMPERATURE
A/C Off/On
Engine @ Idle <2 Km/h (1 MPH)
Vehicle Speed
Fan
Speed
Low High Low High Low High
Fan On:
102°C
(216°F)
110°C
(230°F)
99°C (210°F) -
After 2nd Fan
Cycle
110°C (230°F) 63°C (145°F) if
coolant<93°C
(199°F)
67°C (153°F)
60°C (140°F) if
coolant>99°C
(210°F)
Fan Off:
99°C
(210°F)
105°C
(221°F)
Fan on time = 4
minutes*
105°C (221°F) Fan on time = 8
minutes*
Fan on time = 4
minutes*
*Minimum fan on time = 90 seconds
A/C PRESSURE
TRANSMISSION OIL TEMPERATURE
Fan Speed Low High Low High
Fan On: 1,448 Kpa (210 psi) 1,717 Kpa (249 psi) 102°C (216°F) 109°C (228°F)
Fan Off: 1,207 Kpa (175 psi) 1,510 Kpa (219 psi) 98°C (208°F) 107°C (224°F)
RADIATOR COOLANT FLOW
To determine whether coolant is flowing through
the cooling system, use the following procedure:
• If engine is cold, idle engine until normal oper-
ating temperature is reached. If the upper radiator
hose is hot, coolant is circulating.
WARNING: DO NOT REMOVE COOLANT PRES-
SURE CAP WITH THE SYSTEM HOT AND UNDER
PRESSURE BECAUSE SERIOUS BURNS FROM
COOLANT CAN OCCUR.
ELECTRIC FAN MOTOR
Refer to Power Train Diagnostic Manual for proce-
dure.
COOLANT CONCENTRATION TESTING
Coolant concentration should be checked when any
additional coolant was added to system or after a
coolant drain, flush and refill. The coolant mixture
offers optimum engine cooling and protection against
corrosion when mixed to a freeze point of -37°C
(-34°F) to -59°C (-50°F). The use of a hydrometer or a
refractometer can be used to test coolant concentra-
tion.
A hydrometer will test the amount of glycol in a
mixture by measuring the specific gravity of the mix-
ture. The higher the concentration of ethylene glycol,
the larger the number of balls that will float, and
higher the freeze protection (up to a maximum of
70% by volume glycol).
A refractometer will test the amount of glycol in a
coolant mixture by measuring the amount a beam of
light bends as it passes through the fluid.
Some coolant manufactures use other types of gly-
cols into their coolant formulations. Propylene glycol
is the most common new coolant. However, propylene
glycol based coolants do not provide the same freez-
ing protection and corrosion protection and is only
recommended for limited usage. Refer to appropriate
Technical Service Bulletin(s) regarding use of propy-
lene glycol based coolants.
CAUTION: Do not mix types of coolant—corrosion
protection will be severely reduced.
Because ethylene glycol and propylene glycol do
not have the same specific gravities, the use of a
hydrometer will be inaccurate. Therefore, Special
Tool 8286 refractometer, is recommended when test-
ing either ethylene or propylene glycol coolants.
7 - 16 COOLING SYSTEM LH
DIAGNOSIS AND TESTING (Continued)
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