Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
DEFINITION:
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1 |
Is the coolant in the reservoir at the proper level? | -- | Go to Step 3 | Go to Step 2 | ||||||||||
2 | Add coolant to the coolant reservoir. Use the proper coolant. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
3 | Inspect the vehicle for aftermarket devices that may be blocking airflow to the radiator. Are there any aftermarket devices that are blocking the airflow to the radiator? | -- | Go to Step 4 | Go to Step 5 | ||||||||||
4 | Remove the obstruction. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
5 | Consult with the owner as to if the vehicle has been operated under any of the following conditions:
Has the vehicle been driven under any of the above conditions? | -- | Go to Step 6 | Go to Step 7 | ||||||||||
6 | Advise the owner about proper driving techniques. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
7 | Check the engine oil level. Is the engine oil level excessive? | -- | Go to Step 8 | Go to Step 9 | ||||||||||
8 | Remove the excess engine oil. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
9 | Check the radiator for the following:
Are the any obstructed, plugged or bent radiator fins? | -- | Go to Step 10 | Go to Step 11 | ||||||||||
10 | Clean the radiator surface as necessary. Refer to Drive Belt Replacement . Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
11 | Check the drive belt for the following:
Does any of the above apply? | -- | Go to Step 12 | Go to Step 13 | ||||||||||
12 | Replace the drive belt. Refer to Drive Belt Replacement in Engine Mechanical. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
13 | Pressure test the cooling system. Is the cooling system holding pressure? | 103 kPa (15 psi) | Go to Step 14 | Go to Loss of Coolant | ||||||||||
14 | Check the radiator hoses for collapsed or restricted condition. Are any of the radiator hoses collapsed or restricted? | -- | Go to Step 15 | Go to Step 16 | ||||||||||
15 | Replace the hose(s) as necessary. Refer to Radiator Hose Replacement . Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
16 | Check the thermostat for proper operation. Refer to Thermostat Diagnosis . Is the thermostat operating normally? | -- | Go to Step 18 | Go to Step 17 | ||||||||||
17 | Replace the thermostat. Refer to Engine Coolant Thermostat Replacement . Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
18 | Check for a clogged radiator coolant passage(s). Refer to Flushing . Are the radiator coolant passage(s) clogged? | -- | Go to Step 19 | Go to Step 20 | ||||||||||
19 | Repair or replace the radiator as necessary. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
20 | Check for a blockage in the engine block coolant passage(s). Are the engine block cooling passages normal? | -- | Go to Step 22 | Go to Step 21 | ||||||||||
21 | Clean the engine cooling passage(s) as necessary. Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
22 | Check the radiator fan blade clutch. Refer to Fan Replacement . Is the fan blade clutch operating normally? | -- | Go to Step 24 | Go to Step 23 | ||||||||||
23 | Replace the fan blade clutch. Refer to Fan Replacement . Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
24 | Check the coolant pump for a low pumping volume. Is the pumping volume of the pump normal? | -- | System OK | Go to Step 25 | ||||||||||
25 | Replace the coolant pump. Refer to Water Pump Replacement . Is the repair complete? | -- | Go to Step 26 | -- | ||||||||||
26 |
Does the engine still overheat? | -- | Go to Step 1 | System OK | ||||||||||
