CONDITION POSSIBLE CAUSES CORRECTION
7. Coolant level low in radiator but not
in coolant reserve/overflow tank. This
means the radiator is not drawing
coolant from the coolant reserve/
overflow tank as the engine cools
7. (a) Check condition of radiator cap
and cap seals. Refer to Radiator Cap in
this Group. Replace cap if necessary.
(b) Check condition of radiator filler
neck. If neck is bent or damaged,
replace radiator.
(c) Check condition of the hose from the
radiator to the coolant tank. It should fit
tight at both ends without any kinks or
tears. Replace hose if necessary.
(d) Check coolant reserve/overflow tank
and tanks hoses for blockage. Repair as
necessary.
8. Incorrect coolant concentration 8. Check coolant. Refer to Coolant
section in this Group for correct
coolant/water mixture ratio.
9. Coolant not flowing through system 9. Check for coolant flow at radiator filler
neck with some coolant removed,
engine warm and thermostat open.
Coolant should be observed flowing
through radiator. If flow is not observed,
determine area of obstruction and repair
as necessary.
10. Radiator or A/C condenser fins are
dirty or clogged.
10. Remove insects and debris. Refer to
Radiator Cleaning in this Group.
11. Radiator core is corroded or
plugged.
11. Have radiator re-cored or replaced.
12. Aftermarket A/C installed without
proper radiator.
12. Install proper radiator.
13. Fuel or ignition system problems. 13. Refer to Fuel and Ignition System
Groups for diagnosis.
14. Dragging brakes. 14. Check and correct as necessary.
Refer to Group 5, Brakes for correct
procedures.
15. Bug screen or cardboard is being
used, reducing airflow.
15. Remove bug screen or cardboard.
16. Thermostat partially or completely
shut.
16. Check thermostat operation and
replace as necessary. Refer to
Thermostats in this Group.
17. Viscous fan drive not operating
properly.
17. Check fan drive operation and
replace as necessary. Refer to Viscous
Fan Drive in this Group.
18. Cylinder head gasket leaking. 18. Check for cylinder head gasket
leaks. Refer to Cooling System-Testing
For Leaks in this Group. For repair, refer
to Group 9, Engines.
19. Heater core leaking. 19. Check heater core for leaks. Refer
to Group 24, Heating and Air
Conditioning. Repair as necessary.
7 - 12 COOLING SYSTEM DN
DIAGNOSIS AND TESTING (Continued)
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