Are the cooling fans coming on ? Go under the hood in the engine compartment , with the vehicle running have some one turn on the A/C , do you see and or hear the cooling fans come on ? Could be the coolant temperature gauge is bad ! How many miles on the vehicle ? Ever have water pump replaced ?
1
Check for a loss of system pressure.
Is there a loss of system pressure?
--
Go to Step 2 yes
Go to Step 3 no
2
Inspect and repair any faulty hose connections.
Does the engine still overheat?
--
Go to Step 3 yes
System OK
3
Check for low coolant protection (-37?°C/-34?°F).
Is there low coolant protection (-37?°C/-34?°F)?
--
Go to Step 4 yes
Go to Step 5 no
4
Test solution. Replace the coolant if necessary.
Does the engine still overheat?
--
Go to Step 5 yes
System OK
5
Check the water pump belt for low tension.
Is the water pump belt tension too low?
--
Go to Step 6 yes
Go to Step 7 no
6
Replace the water pump belt tensioner.
Does the engine still overheat?
--
Go to Step 7 yes
System OK
7
Check for an inoperative thermostat bypass.
Is the thermostat bypass inoperative?
--
Go to Step 8 yes
Go to Step 9 no
8
Replace the bypass.
Does the engine still overheat?
--
Go to Step 9 yes
System OK
9
Check the water pump.
Is the water pump inoperative?
--
Go to Step 10 yes
Go to Step 11 no
10
Replace the water pump.
Does the engine still overheat?
--
Go to Step 11 yes
System OK
11
Check the radiator fins for obstruction.
Are the radiator fins obstructed?
--
Go to Step 12 yes
Go to Step 13 no
12
Inspect and clean the radiator fans.
Does the engine still overheat?
--
Go to Step 13 yes
System OK
13
Check the cooling system passage for obstruction.
Is the cooling system passage blocked?
--
Go to Step 14 yes
Go to Step 15 no
14
Inspect and flush the system. Reroute or replace the hose if necessary.
Does the engine still overheat?
--
Go to Step 15 yes
System OK
15
Check the water pump belt for damage.
Is the water pump belt damaged?
--
Go to Step 16 yes
Go to Step 17 no
16
Replace the water pump belt.
Does the engine still overheat?
--
Go to step 17 yes
System OK
17
Check the cooling fans.
Are the cooling fans inoperative?
--
Go to Step 18 yes
Go to Step 19 no
18
- Inspect the electrical connector. Replace if necessary.
- Does the engine still overheat?
--
Go to Step 19 yes
System OK
19
Check the throttle body circuit flow.
Is the throttle body circuit flow restricted?
--
Go to Step 20
Go to Step 21
20
- Inspect the orifice and associated hose. Replace if necessary.
- Does the engine still overheat?
--
Go to Step 21
System OK
21
Check for a stuck thermostat.
Is the thermostat stuck in the closed position?
--
Go to Step 22
--
22
Replace the thermostat.
Does the engine still overheat?
--
--
System OK
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