Check 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

--

Check for a leaking heater core.

Is the heater core leaking?

Go to Step 4

Go to Step 5

Check for a faulty surge pressure cap.

Is the cap operating properly?

Go to Step 5

Go to Step 2

Check for a leaking surge tank hoses, a cracked surge tank or a nicked surge tank neck. Refer to Radiator Surge Tank Replacement .

Is the reservoir or the hose leaking?

Go to Step 2

Go to Step 6

Check for any loose or damaged hoses and connections.

Are any hoses damaged or are any hose connections leaking?

Go to Step 2

Go to Step 7

Check for a cracked thermostat housing or a leaking thermostat seal. Refer to Engine Coolant Thermostat Replacement .

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

Go to Step 2

Go to Step 8

Check 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

Check for a cracked water pump shaft 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

Check for a leaking engine block coolant drain hole plug or knock sensor.

Are any drain hole plugs or knock sensors leaking?

Go to Step 2

Go to Step 12

Check for any leaking cylinder head core plugs.

Are the cylinder head core plugs leaking?

Go to Step 2

Go to Step 13

Check for a leaking cylinder head gaskets, vents or a cracked cylinder heads.

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

Go to Step 2

Go to Step 14

Check 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

Check for a cracked cylinder block.

Is the cylinder block cracked?

Go to Step 2

Go to Step 16

Check for any porous castings.

Are the castings OK?

System OK

--