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Step
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Action
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Yes
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No
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DEFINITION: The engine temperature lamp comes on and stays on, or temperature gauge shows hot, or coolant overflows from the surge tank onto the ground while the engine is running.
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1
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Check the condenser, radiator, and auxiliary coolers for any obstructions or bent fins that would prevent air flow through the radiator.
Is there any airflow obstruction or bent fins?
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Go to
Step 2
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Go to
Step 3
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2
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1.
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Remove any debris that may cause an air flow obstruction.
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2.
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Remove or relocate aftermarket add-on components that block air flow to the radiator.
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Does the engine still overheat?
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Go to
Step 3
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System OK
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3
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Check for loose, missing, or damaged radiator air seals or deflectors.
Are there any loose, missing, or damaged radiator air seals or deflectors?
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Go to
Step 4
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Go to
Step 5
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4
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Repair or replace any loose, missing, or damaged radiator air seals or deflectors.
Does the engine still overheat?
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Go to
Step 5
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System OK
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5
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Check for an inoperative cooling fan. Refer to
Cooling Fan Inoperative (LAU)
Cooling Fan Inoperative (LF1)
.
Is the thermostat operating properly?
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Go to
Step 6
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Go to
Step 7
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6
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Repair or replace the cooling fan(s) as necessary. Refer to
Engine Coolant Fan Motor Replacement (LF1)
.
Does the engine still overheat?
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Go to
Step 7
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System OK
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7
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Check for a loss of coolant. Refer to
Loss of Coolant
.
Does the engine still overheat?
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Go to
Step 8
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System OK
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8
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Check for kinked or pinched cooling hoses.
Are any cooling hoses kinked or pinched?
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Go to
Step 9
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Go to
Step 10
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9
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1.
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Relieve any kinks by rerouting the hoses.
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2.
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Replace the hoses, if necessary.
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Does the engine still overheat?
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Go to
Step 10
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System OK
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10
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Using
J-26568
Coolant and Battery Fluid Tester check the coolant concentration.
Does the coolant concentration test correctly?
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Go to
Step 12
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Go to
Step 11
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11
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Replace the coolant, if necessary. Refer to
Loss of Coolant
.
Does the engine still overheat?
|
Go to
Step 12
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System OK
|
12
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Check for any blocked cooling system passages.
Are there blocked cooling system passages?
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Go to
Step 13
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Go to
Step 14
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13
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Remove any obstructions by flushing the cooling system. Refer to
Flushing
.
Does the engine still overheat?
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Go to
Step 14
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Go to
Step 19
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14
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Inspect the accessory drive belt tensioner. Refer to
Drive Belt Tensioner Diagnosis
.
Does the engine still overheat?
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Go to
Step 15
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System OK
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15
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Check for a faulty thermostat. Refer to
Thermostat Diagnosis
.
Does the engine still overheat?
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Go to
Step 16
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System OK
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16
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Replace the radiator. Refer to
Radiator Replacement (LAU)
Radiator Replacement (LF1)
.
Does the engine still overheat?
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Go to
Step 17
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System OK
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17
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Check for a faulty water pump. The impeller blades may be eroded or broken.
Is the water pump faulty?
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Go to
Step 18
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-
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18
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Replace the water pump. Refer to
Water Pump Replacement (LAU)
Water Pump Replacement (LF1)
.
Did you complete the repair?
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Go to
Step 19
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-
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19
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Operate the system to verify the repair.
Did you correct the condition?
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System OK
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-
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