ENGINE THERMOSTAT TESTING
The thermostat is operated by a wax filled con-
tainer (pellet) which is sealed so that when heated to
a predetermined temperature. The wax expands
enough to overcome the closing spring and water
pump pressure, which forces the valve to open. Cool-
ant leakage into the pellet will cause a thermostat to
fail open. Do not attempt to free up a thermostat
with a screwdriver.
The thermostat that opens too soon type failure
mode is included in the on-board diagnosis. The
check engine light will not be lit by an open too soon
condition. If it has failed open, code 17 will be set. Do
not change a thermostat for lack of heater perfor-
mance or temperature gage position, unless code 17
is present. See diagnosis for other probable causes.
Thermostat failing shut is the normal long term
mode of failure, and normally, only on high mileage
vehicles. The temperature gauge will indicate this,
Refer to diagnosis in this section.
WATER PUMP DIAGNOSIS
A quick flow test to tell whether or not the pump is
working is to see if the heater warms properly. A
defective pump will not be able to circulate heated
coolant through the long heater hose.
Another flow test to help determine pump opera-
tion, remove radiator cap.
WARNING: DO NOT remove radiator cap if the cool-
ing system is hot or under pressure.
COOLING SYSTEM FLOW CHECK
To determine whether coolant is flowing through
the cooling system, use the following procedures:
(1) If engine is cold, idle engine until normal oper-
ating temperature is reached. Then feel the upper
radiator hose. If it is hot, coolant is circulating.
WARNING:
DO NOT REMOVE THE COOLING SYS-
TEM PRESSURE CAP WITH THE SYSTEM HOT AND
UNDER PRESSURE BECAUSE SERIOUS BURNS
FROM COOLANT CAN OCCUR.
(2) Remove pressure cap when engine is cold,
remove small amount of coolant Idle engine until
thermostat opens, you should observe coolant flow
while looking down the filler neck. Once flow is
detected install the pressure cap.
RADIATOR FAN CONTROL
Fan control is accomplished three ways. The fan
runs when the air conditioning pressure reaches a
set psi see charts below. In addition to this control,
the fan is turned on by the temperature of the cool-
ant which is sensed by the coolant temperature sen-
sor
which
sends
the
message
to
the
Engine
Controller. The Engine Controller turns on the fan
through the fan relay. On models equipped with auto-
matic transmission, a transmission fluid thermister
may have some influences on fan operation. See Wir-
ing Diagrams Manual for circuity and diagnostics
provided.
The Power Train Control Module (PCM) provides
fan control for the following conditions:
•
The fan will not run during cranking until the
engine starts no matter what the coolant tempera-
ture is.
•
Fan will run when the air conditioning clutch is
engaged, low pressure cutout switch is closed and
once set compressor head pressure is reached. See
charts.
•
Fan will run according to the following informa-
tion charts.
RADIATOR FAN OPERATION—2.0L ENGINE
Radiator Fan Control
A/C Pressure
A/C Off
Low
High
Fan On:
104°C
(220°F)
110°C
(230°F)
Fan Off:
99°C
(210°F)
104°C
(220°F)
A/C On
Low
High
Low
High
Fan On:
99°C
(210°F)
110°C
(230°F)
1,466
Kpa
(209
psi)
1,717 Kpa
(249 psi)
Fan Off:
93°C
(200°F)
104°C
(220°F)
1,172
Kpa
(170
psi)
1,579 Kpa
(229 psi)
EATX Fluid Temperature
Low
Speed
High
Speed
Fan On:
116°C
(240°F)
120°C
(248°F)
Fan Off:
109°C
(228°F)
116°C
(240°F)
JA
COOLING SYSTEM
7 - 17
DIAGNOSIS AND TESTING (Continued)
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Page 1318: ...SPECIAL TOOLS BODY REMOVER MOLDINGS C 4829 STICK TRIM C4755 JA BODY 23 47 ...
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