Check for an incorrect or damaged radiator filler or surge tank cap.

Was the incorrect cap installed or is the cap damaged?

103 kPa (15 psi)

Go to Step 2

Go to Step 3

Do a cap pressure test. Refer to Radiator Diagnosis . If necessary, replace the cap. Refer to Radiator Assembly .

Is there still a loss of coolant?

--

Go to Step 3

System OK

Check for a leaking coolant recovery reservoir or surge tank, or for a loose or damaged reservoir or surge tank hose.

Is there a leak in the reservoir or surge tank, or is the reservoir or surge tank hose damaged?

--

Go to Step 4

Go to Step 5

Replace the coolant recovery reservoir or the surge tank.

Is there still a loss of coolant?

--

Go to Step 5

System OK

Check for any loose or damaged radiator hoses and connections.

Are any radiator hoses or hose connections damaged?

--

Go to Step 6

Go to Step 7

Reseat the hoses and clamps. If necessary, replace the hoses and the clamps. Refer to Radiator Hose Replacement .

Is there still a loss of coolant?

--

Go to Step 7

System OK

Check for a coolant pump gasket leak.

Is there a leak at the water pump gasket?

--

Go to Step 8

Go to Step 9

Replace the water pump gasket.

1. On the 3.8L (L36) engine, refer to Water Pump Replacement .
2. On the 3.8L (L67) engine, refer to Water Pump Replacement .

Is there still a loss of coolant?

--

Go to Step 9

System OK

Check for a coolant pump seal leak.

Is there a leak at the coolant pump seal?

--

Go to Step 10

Go to Step 11

Replace the coolant pump.

1. On the 3.8L (L36) engine, refer to Water Pump Replacement .
2. On the 3.8L (L67) engine, refer to Water Pump Replacement .
3. On the L47 engine, refer to Water Pump Replacement .

Is there still a loss of coolant?

--

Go to Step 11

System OK

Check if the cylinder head bolts are tightened to specification.

Are the cylinder head bolts tightened to specifications?

--

Go to Step 13

Go to Step 12

Tighten the cylinder head bolts to specifications. If necessary, replace the cylinder head gasket.

Is there still a loss of coolant?

--

Go to Step 13

System OK

Inspect the radiator and check for any coolant leaks.

Is the radiator leaking coolant?

--

Go to Step 14

Go to Step 15

Replace the radiator. Refer to Radiator Replacement .

Is there still a loss of coolant?

--

Go to Step 15

System OK

Check the following for leaks:

1. The intake manifold
2. The engine block coolant drain hole plug
3. The heater core

Are any coolant leaks occurring at these locations?

--

Go to Step 16

System OK

Make the necessary repairs or replace the components as necessary in order to repair the leak.

Is there still a loss of coolant?

--

--

System OK