Step
|
Action
|
Values
|
Yes
|
No
|
1
|
|
1. |
Pressure test the cooling system and the cap for
leaks. |
|
2. |
Repair any leaks before proceeding. These engines
use a 105°C (221°F) thermostat. The ambient temperatures
should be within the specified range given. |
|
3. |
Set the HVAC controls in the OFF position. |
|
4. |
Run the cold engine at idle 20°C-21°C
(68-70°F) for 15-20 minutes before checking the engine
temperature. |
|
5. |
Check the engine coolant temperature at idle with
the scan tool. |
Is the engine coolant temperature (ECT) between 105-120°C
(221-248°F)?
|
13-38°C (55-100°F)
|
System OK
|
Go to Step 2
|
2
|
Is the ECT below 105°C (221°F)?
|
-
|
Go to Step 3
|
Go to Step 4
|
3
|
The thermostat is opening early, or the thermostat seal is
leaking.
Replace the thermostat and the thermostat seal.
Is the repair complete?
|
-
|
System OK
|
-
|
4
|
Is the ECT over 120°C (248°F)?
|
-
|
Go to Step 5
|
-
|
5
|
Is the radiator inlet hot?
|
-
|
Go to Step 6
|
Go to Step 7
|
6
|
|
2. |
Check if hot air is coming from the heater
outlets. |
Is the air hot?
|
-
|
Go to Step 11
|
Go to Step 12
|
7
|
There may be air in the system.
|
2. |
Recheck the radiator inlet hose. |
Is the inlet hose hot?
|
-
|
Go to Step 6
|
Go to Step 8
|
8
|
Inspect for blockage in the following areas:
Is there a blockage?
|
-
|
Go to Step 9
|
Go to Step 10
|
9
|
|
2. |
Recheck the coolant temperature with the scan
tool. |
Is the repair complete?
|
-
|
System OK
|
-
|
10
|
|
2. |
Recheck the coolant temperature with the scan
tool. |
Is the repair complete?
|
-
|
System OK
|
-
|
11
|
Inspect for blockage in the radiator.
Is there any blockage?
|
-
|
Go to Step 9
|
Go to Step 10
|
12
|
|
1. |
Accelerate the engine several times in order to
remove any air from the system. |
|
2. |
Inspect for blockage in the heater circuit. |
|
3. |
Inspect for any pinched or buckled hoses. |
Is there any blockage?
|
-
|
Go to Step 9
|
Go to Step 13
|
13
|
Is the repair complete?
|
|
System OK
|
-
|
