For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Inspect the radiator. Is the radiator leaking? | Go to Step 2 | Go to Step 3
2 | Repair the radiator as necessary. Is a loss of coolant still evident? | Go to Step 3 | System OK
3 | Inspect the radiator cap. Is the radiator cap faulty? | Go to Step 4 | Go to Step 5
4 |

1. Perform a radiator cap pressure test.
2. Replace the cap if necessary.

Is a loss of coolant still evident?

Go to Step 5

System OK

5 | Inspect the following components:

• | The coolant reservoir

• | The hose

Is the coolant recovery reservoir or the hose leaking?

Go to Step 6

Go to Step 7

6 | Replace the reservoir or the hose. Is a loss of coolant still evident? | Go to Step 7 | System OK
7 | Inspect the following components:

• | The radiator

• | The heater hoses

• | The connections

Is any damage evident?

Go to Step 8

Go to Step 9

8 | Repair or replace the components as necessary in order to correct the leak. Is a loss of coolant still evident? | Go to Step 9 | System OK
9 | Inspect the water pump seal. Is the water pump seal leaking? | Go to Step 10 | Go to Step 11
10 | Replace the water pump. Is a loss of coolant still evident? | Go to Step 11 | System OK
11 | Inspect the water pump sealing surface. Is the water pump O-Ring leaking? | Go to Step 12 | Go to Step 13
12 | Replace the O-Ring. Is a loss of coolant still evident? | -- | System OK
13 | Inspect the cylinder block, cylinder head and gasket surface. Is the cylinder block, cylinder head or gasket leaking? | Go to Step 14 | System OK
14 | Repair or replace the components as necessary in order to correct the leak. Is a loss of coolant still evident? | -- | System OK