03-03-9
Engine Cooling
03-03-9
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST
8:
ENGINE OVERHEATS (Continued)
Test Step
Result
�
Action to Take
86
CHECK ELECTRIC COOLING FAN
•
Check temperature gauge at instrument cluster;
Yes
�
GO to Section 03-00 for engine
allow engine to run until high side of normal range is
service procedure.
attained.
No
�
GO to Section 12-00 for proper
•
Check for cooling fan motor and fan blade
service procedure of cooling fan
operation.
motor and fan blade.
•
Did cooling fan motor and fan blade operate OK?
PINPOINT TEST C: ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE
Test Step
Result
�
Action to Take
C1
CHECK ENGINE TEMPERATURE
•
Start engine and allow to run for 10 minutes .
Yes
�
REPLACE water thermostat as
•
Feel heater inlet and outlet hoses and underside of
described. RETEST system.
upper radiator hose.
No
�
GO to Section 1 3-0 1 for proper
•
Are hoses cold?
Temperature Gauge Diagnosis.
PINPOINT TEST D: ENGINE BLOCK HEATER DOES NOT OPERATE PROPERLY
Test Step
D1
CHECK POWER CABLE OPEN
•
Check resistance of Circuits 1 , 2 and 3 in power
cable using Rotunda 73 Digital Multimeter
105-R0051 or equivalent.
•
Is resistance less than 5.0 ohms?
0
I
I
I
I
I
I
I
-
- - - - -
�
_,
L
D2
CHECK POWER CABLE SHORT
AQ0045-A
•
Check resistance of Circuits 1 , 2 and 3 in power
cable using Rotunda 73 Digital Multimeter
105-R005 1 or equivalent.
•
Is resistance more than 10 K ohms?
0
�
,
_ _ _
AQ0046-A
Yes
No
Yes
No
Result
Action to Take
�
GO to D2.
�
REPLACE power cable. RETEST
system.
�
REPLACE block heater. RETEST
system.
�
REPLACE power cable. RETEST
system.
1997 Thunderbird,
Cougar
July 1996