Inspect for a leaking radiator.

Is the radiator leaking?

Go to Step 2

Go to Step 3

Repair or install new parts as necessary.

Is the repair complete?

System OK

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Inspect for a leaking heater core.

Is the heater core leaking?

Go to Step 2

Go to Step 4

Inspect for a faulty radiator surge tank cap.

Is the cap operating properly?

Go to Step 5

Go to Step 2

Inspect for a leaking coolant recovery hose or a cracked surge tank.

Is the surge tank or the hose leaking?

Go to Step 2

Go to Step 6

Inspect for any loose or damaged hoses or connections.

Are any hoses damaged or are any hose connections leaking?

Go to Step 2

Go to Step 7

Inspect for a cracked thermostat housing or a leaking thermostat seal.

Is the thermostat housing cracked or is there a seal leak?

Go to Step 2

Go to Step 8

Inspect for a cracked water pump or a leaking water pump gasket.

Is the water pump cracked or is there a leaking gasket?

Go to Step 2

Go to Step 9

Inspect for a leaking water pump driveshaft seal.

Is the water pump shaft seal leaking?

Go to Step 10

Go to Step 11

Replace the water pump. Refer to Water Pump Replacement .

Is the repair complete?

System OK

Go to Step 11

Inspect for a leaking engine block coolant drain hole plug.

Are any drain hole plugs leaking?

Go to Step 2

Go to Step 12

Inspect for any leaking cylinder head core plugs.

Are the cylinder head core plugs leaking?

Go to Step 2

Go to Step 13

Inspect for a leaking cylinder head gasket(s), vent(s) or a cracked cylinder head(s).

Is the cylinder head gasket leaking or is the cylinder head cracked?

Go to Step 2

Go to Step 14

Inspect for a cracked throttle body or a gasket leak.

Is the throttle body cracked or is there a gasket leak?

Go to Step 2

Go to Step 15

Inspect for a cracked cylinder block.

Is the cylinder block cracked?

Go to Step 2

Go to Step 16

Inspect for any porous castings.

Are the castings OK?

System OK

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