GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

1

Check for an incorrect or damaged radiator filler cap.

Was the incorrect radiator cap installed or is the radiator cap damaged?

103 kPa (15 psi)

Go to Step 2

Go to Step 3

2

Do a cap pressure test. Refer to Pressure Cap Testing . If necessary, replace the cap.

Is there still a loss of coolant?

--

Go to Step 3

System OK

3

Check for a loose or damaged reservoir hose.

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

--

Go to Step 4

Go to Step 5

4

Replace the surge tank. Refer to Radiator Surge Tank Replacement .

Is there still a loss of coolant?

--

Go to Step 5

System OK

5

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

6

Reseat the hoses and clamps. If necessary, replace the hoses and the clamps.

Is there still a loss of coolant?

--

Go to Step 7

System OK

7

Check for a water pump gasket leak.

Is there a leak at the water pump gasket?

--

Go to Step 8

Go to Step 9

8

Replace the water pump gasket.Refer to Water Pump Replacement .

Is there still a loss of coolant?

--

Go to Step 9

System OK

9

Check for a water pump seal leak.

Is there a leak at the water pump seal?

--

Go to Step 10

Go to Step 11

10

Replace the water pump. Refer to Water Pump Replacement .

Is there still a loss of coolant?

--

Go to Step 11

System OK

11

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

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

13

Inspect the radiator and check for any coolant leaks.

Is the radiator leaking coolant?

--

Go to Step 14

Go to Step 15

14

Replace the radiator. Refer to Radiator Replacement .

Is there still a loss of coolant?

--

Go to Step 15

System OK

15

Check the following for leaks:

  1. The intake manifold
  2. The engine block coolant drain hole plug or the knock sensors
  3. The heater core

Are any coolant leaks occurring at these locations?

--

Go to Step 16

System OK

16

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