Engine Overheating. Cadillac Concours 1997

For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Check for a loss of system pressure. Is there a loss of system pressure? | -- | Go to Step 2 | Go to Step 3
2 | Inspect and repair any faulty hose connections. Does the engine still overheat? | -- | Go to Step 3 | System OK
3 | Check for low coolant protection (-37°C/-34°F). Is there low coolant protection (-37°C/-34°F)? | -- | Go to Step 4 | Go to Step 5
4 | Test solution. Replace the coolant if necessary. Does the engine still overheat? | -- | Go to Step 5 | System OK
5 | Check the water pump belt for low tension. Is the water pump belt tension too low? | -- | Go to Step 6 | Go to Step 7
6 | Replace the water pump belt tensioner. Does the engine still overheat? | -- | Go to Step 7 | System OK
7 | Check for an inoperative thermostat bypass. Is the thermostat bypass inoperative? | -- | Go to Step 8 | Go to Step 9
8 | Replace the bypass. Does the engine still overheat? | -- | Go to Step 9 | System OK
9 | Check the water pump. Is the water pump inoperative? | -- | Go to Step 10 | Go to Step 11
10 | Replace the water pump. Does the engine still overheat? | -- | Go to Step 11 | System OK
11 | Check the radiator fins for obstruction. Are the radiator fins obstructed? | -- | Go to Step 12 | Go to Step 13
12 | Inspect and clean the radiator fans. Does the engine still overheat? | -- | Go to Step 13 | System OK
13 | Check the cooling system passage for obstruction. Is the cooling system passage blocked? | -- | Go to Step 14 | Go to Step 15
14 | Inspect and flush the system. Reroute or replace the hose if necessary. Does the engine still overheat? | -- | Go to Step 15 | System OK
15 | Check the water pump belt for damage. Is the water pump belt damaged? | -- | Go to Step 16 | Go to Step 17
16 | Replace the water pump belt. Does the engine still overheat? | -- | Go to step 17 | System OK
17 | Check the cooling fans. Are the cooling fans inoperative? | -- | Go to Step 18 | Go to Step 19
18 | Inspect the electrical connector. Replace if necessary. Does the engine still overheat? | -- | Go to Step 19 | System OK
19 | Check the throttle body circuit flow. Is the throttle body circuit flow restricted? | -- | Go to Step 20 | Go to Step 21
20 | Inspect the orifice and associated hose. Replace if necessary. Does the engine still overheat? | -- | Go to Step 21 | System OK
21 | Check for a stuck thermostat. Is the thermostat stuck in the closed position? | -- | Go to Step 22
22 | Replace the thermostat. Does the engine still overheat? | -- | System OK