For 1990-2009 cars

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 Radiator Diagnosis . If necessary, replace the cap. Refer to Radiator Assembly . Is there still a loss of coolant? | -- | Go to Step 3 | System OK
3 | Check for a leaking coolant recovery reservoir or 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 coolant recovery reservoir. Refer to Coolant Recovery Reservoir 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. Refer to Radiator Hose Replacement . Is there still a loss of coolant? | -- | Go to Step 7 | System OK
7 | Check for a coolant pump gasket leak. Is there a leak at the coolant pump gasket? | -- | Go to Step 8 | Go to Step 9
8 | Replace the coolant 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

9 | Check for a coolant pump seal leak. Is there a leak at the coolant pump seal? | -- | Go to Step 10 | Go to Step 11
10 | 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 .

Is there still a loss of coolant?

--

Go to Step 11

System OK

11 | Check if the cylinder head bolts are tightened to specification. Refer to Fastener Tightening Specifications in Engine Mechanical. Are the cylinder head bolts tightened to specifications? | -- | Go to Step 13 | Go to Step 12
12 | Tighten the cylinder head bolts to specifications. Refer to Fastener Tightening Specifications in Engine Mechanical. 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