Step | Action | Value | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
DEFINITION: The engine temperature lamp comes on and stays on, or the temperature gauge shows hot, or the coolant overflows from the coolant recovery reservoir/radiator surge tank onto the ground while the engine is running. | ||||||||||||
1 | Check for a loss of coolant. Is there a loss of coolant? | -- | ||||||||||
2 | Fill the system to the specified level. Refer to Loss of Coolant . Does the engine still overheat? | -- | System OK | |||||||||
3 | Check for a missing or damaged radiator upper air deflector, baffle, or center air deflector. Are there any missing or damaged deflectors or baffles? | -- | ||||||||||
4 | Repair or replace any deflectors or baffles as necessary. Does the engine still overheat? | -- | System OK | |||||||||
5 | Check the coolant concentration. Refer to Coolant Concentration Testing . Is the coolant concentration adequate? | -- | ||||||||||
6 | Correct the coolant concentration as necessary. Refer to Notice: Pure coolant can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent, as the freeze level rises rapidly after this point. Pure coolant will freeze at -22°C (-8°F). .Does the engine still overheat? | -- | System OK | |||||||||
7 | Check for a loss of cooling system pressure. Does the system maintain the correct pressure? | -- | ||||||||||
8 | Pressure test the cooling system. Correct as necessary. Refer to Radiator Leak Testing . Does the engine still overheat? | 103 kPa (15 psi) | System OK | |||||||||
9 | Check for a pinched or kinked coolant recovery reservoir hose or surge tank hose. Is the reservoir/surge tank hose kinked or damaged? | -- | ||||||||||
10 | Reroute or replace the hose as necessary.
Does the engine still overheat? | -- | System OK | |||||||||
11 |
Is the tensioner working properly? | -- | ||||||||||
12 | Replace the tensioner as necessary.
Does the engine still overheat? | -- | System OK | |||||||||
13 | Check for restricted coolant flow through the throttle body passage. Is the coolant passage of the throttle body restricted? | -- | ||||||||||
14 | Inspect the orifice and associated hose of the throttle body. Does the engine still overheat? | -- | System OK | |||||||||
15 | Check for obstructed radiator air flow or bent fins. Are any radiator fins bent or is air flow to the radiator being obstructed? | -- | ||||||||||
16 | Remove or relocate add on parts that block air flow to the radiator. Refer to Cooling System Maintenance Recommendations . Does the engine still overheat? | -- | System OK | |||||||||
17 | Check for a blockage in the cooling system passages. Are the cooling system passages blocked? | -- | ||||||||||
18 |
Does the engine still overheat | -- | System OK | |||||||||
19 | Check for an inoperative cooling fan(s). Does the engine still overheat? | -- | System OK | |||||||||
20 |
Does the engine still overheat? | -- | System OK | |||||||||
21 | Check for a stuck closed thermostat. Refer to Thermostat Diagnosis . Is the thermostat stuck (or is the thermostat sticking) in the closed position? | -- | ||||||||||
22 | Replace the thermostat.
| -- | System OK | |||||||||
23 | Check for a faulty coolant pump. Is the water pump faulty? | -- | ||||||||||
24 | Replace the coolant pump.
Does the engine still overheat? | -- | System OK | |||||||||
25 |
Is the correct sized radiator being used? | -- | System OK | |||||||||
26 | If necessary, replace the radiator. Refer to Radiator Replacement . Does the engine still overheat? | -- | -- | System OK | ||||||||
