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CS
RADIATOR FAN
OPERATION
COOLANT TEMPERATURE
Fan
Operation
Initial
Speeds:
Fan On:
104°C
(220°F)
Fan Off:
101°C
(214°F)
DIAGNOSIS AND TESTING - RADIATOR FAN MOTOR
CONDITION
NOISY RADIATOR FAN
ELECTRIC FAN MOTOR DOES
NOT OPERATE
ELECTRIC RADIATOR FAN
OPERATES ALL THE TIME
RADIATOR FAN OPERATION CHART
A/C PRESSURE
Max
Initial
110°C
1,724 Kpa
(230°F) Fan
(250 psi)
Speed
Duty-Cycles
(Ramps-up)
from 50% to
99%
Fan Speed
1,379 Kpa
Duty-Cycles
(200 psi)
(Ramps-
down) from
99% to 50%
RADIATOR FAN DIAGNOSIS CHART
POSSIBLE CAUSES
1. Fan blade loose.
2. Fan blade striking a surrounding
object.
3. Air obstructions at radiator or A/C
condenser.
4. Electric fan motor defective.
1. Fan relay, powertrain control
module (PCM), coolant temperature
sensor, or wiring defective.
2. Defective A/C pressure
transducer.
1. Fan relay, powertrain control
module (PCM), coolant temperature
sensor or wiring defective.
2. Check for low coolant level.
3. Defective A/C pressure
transducer.
Max
Initial
2,068 Kpa
98°C (208°F)
(300 psi) Fan
Speed
Duty-Cycles
(Ramps-up)
from 50% to
99%
Fan Speed
89°C (192°F)
Duty-Cycles
(Ramps-
down) from
99% to 50%
CORRECTION
1. Replace fan assembly. (Refer to
7 - COOLING/ENGINE/RADIATOR
FAN - REMOVAL)
2. Locate point of fan blade contact
and repair as necessary.
3. Remove obstructions and/or
clean debris.
4. Replace fan assembly. (Refer to
7 - COOLING/ENGINE/RADIATOR
FAN - REMOVAL)
1. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
2. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
1. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
2. Add coolant as necessary.
3. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
ENGINE 7 - 17
TRANSAXLE OIL
TEMPERATURE
Max
109°C (228°F)
Fan Speed
Duty Cycles
(Ramps-up)
from 50% to
99%
Fan Speed
Duty Cycles
(Ramps-down)
from 99% to
50%
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