|
Step
|
Action
|
Yes
|
No
|
1
|
|
1.
|
Ensure that the cooling system is full.
|
|
2.
|
Allow the engine to cool.
|
|
4.
|
Turn the air conditioning system off.
|
|
5.
|
Inspect the engine cooling fan(s).
|
Is the electric cooling fan on?
|
Go to
Step 2
|
Go to
Step 3
|
2
|
|
2.
|
Verify the customer complaint.
|
Does the engine still fail to reach normal operating temperature?
|
Go to
Step 3
|
System OK
|
3
|
Install the Scan Tool to the DLC. Compare the Scan Tool coolant temperature reading to the I/P cluster coolant temperature.
Is the I/P cluster coolant temperature close to the reading on the Scan Tool?
|
Go to
Step 5
|
Go to
Step 4
|
4
|
|
1.
|
Diagnose and repair the coolant temperature gauge system.
|
|
2.
|
Verify the customer complaint.
|
Does the engine still fail to reach normal operating temperature?
|
Go to
Step 5
|
System OK
|
5
|
Inspect the thermostat for correct operation. Refer to
Thermostat Diagnosis
.
Is the thermostat operating correctly?
|
System OK
|
Go to
Step 6
|
6
|
|
2.
|
Verify the customer complaint.
|
Does the engine still fail to reach normal operating temperature?
|
Go to
Step 1
|
System OK
|
