Loss of Coolant. Cadillac Concours 1997

For 1990-2009 cars

Step | Action | Value | Yes | No
--- | --- | --- | --- | ---
1 | Check for a leaking radiator. Does the radiator leak? | 103 kPa (15 psi) | Go to Step 2 | Go to Step 3
2 | Inspect the cooling system. Is there still a loss of coolant? | -- | Go to Step 3 | System OK
3 | Check for a leaking surge tank or 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
4 | Replace the surge tank or hose. 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. 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. Is there still a loss of coolant? | -- | Go to Step 11 | System OK
11 | Check the surge tank cap. Is the surge tank cap damaged? | -- | Go to Step 12 | Go to Step 13
12 | Replace the surge tank cap. Replace the tank if necessary. Is there still a loss of coolant? | -- | Go to Step 13 | System OK
13 | Check the cylinder head gasket for leaks. Is the cylinder head gasket leaking? | -- | Go to Step 14 | Go to Step 15
14 | Replace the cylinder head gasket. Refer to Cylinder Head Replacement in Engine Mechanical. Is there still a loss of coolant? | -- | Go to Step 15 | System OK
15 | 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 17 | Go to Step 16
16 | Tighten the cylinder head bolts to specifications. Is there still a loss of coolant? | -- | Go to Step 17 | System OK
17 | Inspect the cylinder head and cylinder block. Is the cylinder head or cylinder block cracked? | -- | Go to Step 18 | Go to Step 19
18 | Replace or resurface the cylinder head or cylinder block as necessary. Refer to Cylinder Head Replacement in Engine Mechanical. Refer to Cylinder Block Repair in Engine Mechanical. Is there still a loss of coolant? | -- | Go to Step 19 | System OK
19 | Check for a leaking heater core. Is the heater core leaking? | -- | Go to Step 20 | System OK
20 | 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