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Overheating
1. Insufficient coolant in the system
2. Water pump drive belt defective or
not adjusted properly
3. Radiator core blocked or radiator
grille dirty and restricted
4. Thermostat faulty
5. Fan blades broken or cracked
6. Radiator cap not maintaining proper
pressure. Have the cap pressure tested by gas station or repair shop.
Overcooling
1. Thermostat faulty
2. Inaccurate temperature gauge
3. Wrong thermostat (too cool range)
External coolant
leakage
1. Deteriorated or damaged hoses or
loose clamps. Replace hoses and/or tighten the clamps at the hose
connections
2. Water pump seals defective. If this
is the case, water will drip from the weep hole in the water pump body
3. Leakage from the radiator core or
side tank(s). This will require the radiator to be professionally
repaired.
4. Engine drain plug leaking. Water
jacket core plugs defective.
Internal coolant
leakage
Note: Internal
coolant leaks can usually be detected by examining the oil. Check the
dipstick and inside of the valve cover for water deposits and an oil
consistency like that of a milkshake.
1.
Leaking cylinder head gasket. Have the cooling system pressure tested.
2. Cracked cylinder bore or cylinder
head. Dismantle the engine and inspect
3. Intake manifold gasket leaking
Coolant loss
1. Too much coolant in the system
2. Coolant boiling away due to
overheating
3. External or internal leakage
4. Faulty radiator cap. Have the cap
pressure tested.
Poor coolant
circulation
1. Inoperative water pump. A quick test
is to pinch the top radiator hose closed with your hand while the engine
is idling, then let it loose. You should feel the surge of coolant if the
pump is working properly
2. Restriction in the cooling system.
Drain, flush and refill the system. If necessary, remove the radiator and
have it reverse flushed.
3. Water pump drive belt defective or
not adjusted properly
4. Thermostat sticking
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