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03-03-8
Engine Cooling
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: LOSS OF COOLANT (Continued)
Test Step
A4
CHECK COOLANT FOR INTERNAL LEAKAGE
•
Inspect coolant in radiator and radiator coolant
recovery reservoir or degas bottle (depending upon
application) for signs of transmission fluid or engine
oil.
•
Is oil evident in coolant?
AS
CHECK ENGINE AND TRANSMISSION FOR COOLANT
•
Remove oil level dipstick from engine and
transmission.
•
Carefully inspect oil level dipstick for evidence of
coolant.
•
Is coolant evident?
A6
PRESSURE TEST COOLING SYSTEM
•
Using a cooling system pressure tester, pressurize
cooling system as described in Component Tests,
Pressure Test.
•
Check for any signs of visible leakage .
NOTE: Check inside vehicle for possible heater
core leakage.
•
Is there leakage?
Result
Yes
No
Yes
No
Yes
No
PINPOINT TEST
8:
ENGINE OVERHEATS
Test Step
81
CHECK ENGINE COOLANT LEVEL
NOTE: If engine is hot, allow engine to cool down before
proceeding.
•
Remove pressure relief cap or radiator cap and
check engine coolant level at radiator and radiator
coolant recovery reservoir or degas bottle
(depending upon application).
•
Is engine coolant level OK?
82
CHECK COOLANT CONDITION
•
Check coolant tor contaminants such as rust or
corrosion. Also check tor discoloration and
concentration.
•
Is coolant condition OK?
83
CHECK FOR AIR FLOW OBSTRUCTION
•
Visually inspect A/C condenser core and radiator
for obstructions such as leaves or bugs.
•
Is there any obstruction?
84
CHECK HEATER CORE OPERATION
•
Install pressure relief cap or radiator cap .
•
Start engine and allow to run .
•
As engine starts to warm up, feel the heater inlet
and outlet hoses. They should feel the same after
three or tour minutes.
•
Is heater outlet hose the same temperature as
the inlet hose?
85
CHECK WATER THERMOSTAT OPERATION
•
Allow engine to run tor 10 minutes .
•
Feel the underside of the upper radiator hose .
•
Is the upper radiator hose cold?
Result
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
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03-03-8
Action to Take
If engine oil is evident, GO to
Section 03-oO. If transmission fluid
is evident, GO to Section 07-0 1 .
GO to AS.
It coolant is in engine, GO to
Section 03-00. If coolant is in
transmission, GO to Section 07·0 1 .
GO to A6.
SERVICE as described. RETEST
system.
Cooling system is operational at
this time. RETEST system.
Action to Take
G0 to 82.
REFILL as described. GO to
Pinpoint Test A.
G0 to 83.
FLUSH system as described.
RETEST system.
REMOVE obstruction and clean
A
I
C condenser core and radiator
as described. RETEST system.
G0 to 84.
GO to 85.
TURN engine OFF before it
overheats. SERVICE heater core
as described in Section 1 2-Q3A.
RETEST system.
REPLACE water thermostat as
described. RETEST system.
LEAVE engine running. GO to 86.
1997 Thunderbird, Cougar July 1 996
Содержание Thunderbird
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