Check the coolant level.

Is the coolant level low?

--

Go to Step 2

Go to Step 4

1. Add coolant to the system.

2. Check for visual leaks.

Are there leaks in the system?

--

Go to Loss of Coolant .

Go to Step 3

Pressure test the system.

Are there leaks in the system?

--

Go to Loss of Coolant .

Go to Step 4

Check the condition of the drive belt.

Is the drive belt loose?

--

Go to Drive Belt Falls Off Diagnosis in Engine Mechanical.

Go to Step 5

Check the hoses.

Have the hoses collapsed?

--

Go to Step 6

Go to Step 7

Replace the radiator hoses.

Refer to Radiator Hose Replacement .

Does the engine still overheat?

--

Go to Step 7

System OK

Check the temperature level of the thermostat.

Is the temperature level high?

--

Go to Step 8

Go to Step 9

Replace the thermostat.

Refer to Engine Coolant Thermostat Replacement .

Does the engine still overheat?

--

Go to Step 9

System OK

Check the radiator.

Is the radiator clogged?

--

Go to Inspection/Maintenance Recommendations.

Go to Step 10

Check the engine block.

Is the engine block clogged?

--

Go to Inspection/Maintenance Recommendations.

Go to Step 9

Check for gas leaks into the system.

Is there a gas leak into the engine block?

--

Go to Step 10

Go to Step 12

Check for bubbles in the coolant.

Are there bubbles in the coolant?

--

Go to System Checks.

--

Check the water pump.

Are there bubbles in the coolant?

--

Go to Step 14

System OK

Replace the water pump.

Refer to Water Pump Replacement .

Does the engine still overheat?

--

Go to Step 15

System OK

Check the radiator fan clutch.

Is the radiator fan clutch operating normally?

--

Go to Step 16

Go to Step 17

Check for any of the following conditions that may contribute to the engine overheating:

Does the engine still overheat?

--

--

System OK

Replace the radiator fan clutch. Refer to Fan Replacement .

Does the engine still overheat?

--

--

System OK