Loss of Coolant
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Loss of Coolant
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Inspect for a leaking radiator. Is the radiator leaking? |
Go to Step 2 | Go to Step 3 |
| 2 | Repair or install new parts as necessary. Is the repair complete? |
System OK | - |
| 3 | Inspect for a leaking heater core. Is the heater core leaking? |
Go to Step 2 | Go to Step 4 |
| 4 | Inspect for a faulty radiator surge tank cap. Is the cap operating properly? |
Go to Step 5 | Go to Step 2 |
| 5 | Inspect for a leaking coolant recovery hose or a cracked surge tank. Is the surge tank or the hose leaking? |
Go to Step 2 | Go to Step 6 |
| 6 | Inspect for any loose or damaged hoses or connections. Are any hoses damaged or are any hose connections leaking? |
Go to Step 2 | Go to Step 7 |
| 7 | Inspect for a cracked thermostat housing or a leaking thermostat seal. Is the thermostat housing cracked or is there a seal leak? |
Go to Step 2 | Go to Step 8 |
| 8 | Inspect for a cracked water pump or a leaking water pump gasket. Is the water pump cracked or is there a leaking gasket? |
Go to Step 2 | Go to Step 9 |
| 9 | Inspect for a leaking water pump driveshaft seal. Is the water pump shaft seal leaking? |
Go to Step 10 | Go to Step 11 |
| 10 | Replace the water pump. Refer to Water Pump Replacement (LL8) . Is the repair complete? |
System OK | Go to Step 11 |
| 11 | Inspect for a leaking engine block coolant drain hole plug. Are any drain hole plugs leaking? |
Go to Step 2 | Go to Step 12 |
| 12 | Inspect for any leaking cylinder head core plugs. Are the cylinder head core plugs leaking? |
Go to Step 2 | Go to Step 13 |
| 13 | Inspect for a leaking cylinder head gasket(s), vent(s) or a cracked cylinder head(s). Is the cylinder head gasket leaking or is the cylinder head cracked? |
Go to Step 2 | Go to Step 14 |
| 14 | Inspect for a cracked throttle body or a gasket leak. Is the throttle body cracked or is there a gasket leak? |
Go to Step 2 | Go to Step 15 |
| 15 | Inspect for a cracked cylinder block. Is the cylinder block cracked? |
Go to Step 2 | Go to Step 16 |
| 16 | Inspect for any porous castings. Are the castings OK? |
System OK | - |