Engine Overheating
Engine Overheating |
Step | Action | Yes | No | |||||||||
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.
|
||||||||||||
1
|
Check for a loss of coolant. Refer to
Loss of Coolant
.
Is there a loss of coolant? |
Go to
|
Go to
|
|||||||||
2
|
Fill the system to the specified level.
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
3
|
Check for kinked or pinched surge tank hoses, especially at the radiator.
Are any surge tank hoses kinked or pinched? |
Go to
|
Go to
|
|||||||||
4
|
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
5
|
Check for loose, missing, or damaged radiator air seals or deflectors.
Are there any loose, missing, or damaged radiator air seals or deflectors? |
Go to
|
Go to
|
|||||||||
6
|
Repair or replace any loose, missing, or damaged radiator air seals or deflectors.
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
7
|
Check the coolant concentration.
Does the coolant concentration test correctly? |
Go to
|
Go to
|
|||||||||
8
|
Replace the coolant, if necessary.
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
9
|
Check the system for loss of pressure. Refer to Pressure Cap Testing . Is there a loss of pressure? |
Go to
|
Go to
|
|||||||||
10
|
Repair any leaks, as necessary.
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
11
|
Check for a faulty engine coolant temperature sensor.
Is the engine coolant temperature sensor faulty? |
Go to
|
Go to
|
|||||||||
12
|
Replace the engine coolant temperature sensor. Refer to:
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
13
|
Check the radiator for any air flow obstructions or bent fins.
Is there any airflow obstruction or bent fins? |
Go to
|
Go to
|
|||||||||
14
|
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
15
|
Check for any blocked cooling system passages.
Are there any blocked cooling system passages? |
Go to
|
Go to
|
|||||||||
16
|
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
17
|
Check for an inoperative cooling fan.
Is the cooling fan inoperative? |
Go to
|
Go to
|
|||||||||
18
|
Replace the cooling fan. Refer to
Engine Coolant Fan Motor Replacement (Diesel)
Engine Coolant Fan Motor Replacement (LAU/A28NER)
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
19
|
Check for a thermostat that is stuck closed.
Is the thermostat stuck closed? |
Go to
|
Go to
|
|||||||||
20
|
Replace the thermostat. Refer to
Engine Coolant Thermostat Replacement (LDK/A20NHT)
Engine Coolant Thermostat Replacement (Diesel)
Does the engine still overheat? |
Go to
|
System OK
|
|||||||||
21
|
Check for a faulty water pump. The impeller blades may be eroded or broken.
Is the water pump faulty? |
Go to
|
-
|
|||||||||
22
|
Replace the water pump. Refer to
Water Pump Replacement (Diesel)
Water Pump Replacement (LDK/A20NHT)
Water Pump Replacement (LAU/A28NER)
.
Does the engine still overheat? |
-
|
System OK
|