Loss of Coolant. Cadillac Concours 1996

For 1990-2009 cars

Step | Action | Value | Yes | No
--- | --- | --- | --- | ---
1 | Check for an incorrect or faulty surge tank cap. Is the surge tank cap incorrect or faulty? | -- | Go to Step 2 | Go to Step 3
2 | Replace the surge tank cap. Refer to Cooling System . Is there still a coolant loss? | 103 kPa (15 psi) | Go to Step 3 | System OK

3

1. Check for any loose or damaged coolant hoses.
2. Check the hose connections.

Are any hoses loose or damaged?

--

Go to Step 4

Go to Step 5

4

1. Reseat or retighten the clamps properly on the hoses and the connections.
2. Replace the clamp and the hose if necessary.

Is there still a coolant loss?

--

Go to Step 5

System OK

5 | Check the surge tank and tank hose for any leaks. Is the surge tank hose or tank leaking? | -- | Go to Step 6 | Go to Step 7
6 | Replace the surge tank hose or the surge tank. Refer to Radiator Surge Tank . Is there still a coolant loss? | -- | Go to Step 7 | System OK
7 | Check the cylinder head bolts for the proper torque. Are the bolts tightened to the proper specification? | -- | Go to Step 8 | Go to Step 9
8 | Check for a seal leak at the coolantpump. Is there a seal leak at the water pump? | -- | Go to Step 10 | Go to Step 11
9 | Tighten the cylinder head bolts to the proper specification. Refer to Fastener Tightening Specifications in Engine Mechanical. Is there still a coolant leak? | -- | Go to Step 10 | System OK
10 | Replace the coolant pump. Refer to Water Pump Replacement . Is there still a coolant loss? | -- | Go to Step 11 | System OK
11 | Check for a coolant pump gasket leak. Is the coolant pump gasket leaking? | -- | Go to Step 12 | Go to Step 13
12 | Replace the coolant pump gasket. Refer to Water Pump Replacement . Is there still a coolant loss? | -- | Go to Step 13 | System OK
13 | Check for a leak at the cylinder head gasket. Is there coolant leakage at the cylinder head gasket? | -- | 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 coolant loss? | -- | Go to Step 15 | System OK
15 | Check for coolant leakage at the radiator. Pressure test the cooling system, Refer to Cooling System Leak Testing . Is there coolant leakage at the radiator? | -- | Go to Step 16 | Go to Step 17
16 | Replace the radiator. Refer to Radiator Replacement . Is there still a coolant loss? | -- | Go to Step 17 | System OK
17 | Check the heater core for leakage. Is the heater core leaking? | -- | Go to Step 18 | Go to Step 19
18 | Replace the heater core. Refer to HVAC. Is there still a loss of coolant? | -- | Go to Step 19 | System OK
19 | Check for cracked cylinder head or block. Perform a cylinder leak test. Refer to Cylinder Head Inspection and Measurement in Engine Mechanical. Is the cylinder head or block cracked? | -- | Go to Step 20 | System OK
20 | Resurface the cylinder head or block. Refer to Cylinder Head Inspection and Measurement in Engine Mechanical. If necessary, replace the cylinder head or block. Is there still a coolant loss? | -- | -- | System OK