2-4 Engine Cooling Industrial 1.6L
Diagnostic Information and Procedures
Engine Overheating
Step Action Value(s) Yes No
1
Check the coolant level.
Is the coolant level low?
—
Go to Step 2 Go to Step 3
2
Add coolant to the system
Does the engine still overheat?
—
Go to Step 3 System OK
3
Pressure test the system and check for visual leaks.
Are there any external leaks in the system?
— Go to Loss of
Coolant. Go to Step 4
4
Check the condition of the drive belt.
Is the drive belt loose or unserviceable?
— Adjust or replace
the drive belt. Go to Step 5
5
Check the hoses.
Have the hoses collapsed?
—
Go to Step 6 Go to Step 7
6
Replace the hoses. Refer to Radiator Hose Replacement.
Does the engine still overheat?
—
Go to Step 7 System OK
7
Check the temperature level of the thermostat.
Is the temperature level high?
—
Go to Step 8 Go to Step 9
8
Replace the thermostat. Refer to Thermostat
Replacement. Does the engine still overheat?
—
Go to Step 9 System OK
9
Check the radiator.
Is the radiator clogged?
— Go to Cooling
System Flushing Go to Step 10
10
Check the engine block.
Is the engine block clogged?
— Go to Cooling
System Flushing Go to Step 11
11
Check for bubbles in the coolant.
Are there bubbles in the coolant?
—
Go to Step 12 Go to Step 13
12
Perform a Compression Test. Refer to Engine Mechanical
Were results OK.
—
Go to Step 13
Go to Engine
Mechanical
13
Check the water pump.
Does coolant flow?
—
Go to Step 15 Go to Step 14
14
Replace the water pump. Refer to Water Pump
Replacement.
Does the engine still overheat?
—
Go to Step 15 System OK
15
Check the radiator fan.
Is the radiator fan operating normally?
—
Go to Step 16 Go to Step 17
16
Check for any of the following conditions that may
contribute to the engine overheating:
• An overloaded condition
•
Excess engine oil
•
Blocked air flow through the radiator
• Extreme air temperatures
Does the engine still overheat?
——
System OK
17
Replace the radiator fan. Refer to Cooling Fan
Replacement.
Does the engine still overheat?
——
System OK
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