* Water Pump: While often associated with leaks at the front, a severely worn or damaged water pump *can* leak from the weep hole at the back, especially if the pump is mounted towards the back of the engine.
* Intake Manifold Gasket: A leak in the intake manifold gasket can allow coolant to seep into the engine, sometimes finding its way to the back and dripping out. This is often accompanied by white smoke from the exhaust.
* Head Gasket: This is a serious issue. A blown head gasket can leak coolant into the engine or into an oil passage, potentially mixing coolant and oil. A rear head gasket leak would be more likely to manifest as a rear leak. This often results in overheating, loss of compression, and milky oil.
* Cracked Engine Block or Cylinder Head: A crack in the engine block or cylinder head, particularly near the back, can cause coolant to leak. This is a significant problem requiring repair or engine replacement.
* Freeze Plugs (Core Plugs): These are relatively inexpensive parts and are found in the engine block. If one is corroded or damaged, it can leak coolant. Those in the back of the engine may be harder to see.
* Coolant Hoses: While less likely to leak from the *very* back of the engine, a hose running towards the back might have a crack or a deteriorated clamp.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine the entire engine, focusing on the rear, for visible leaks, wet spots, or stains. Look at all hoses, the water pump, and the area around the intake manifold and cylinder heads.
2. Pressure Test: A radiator pressure test can help identify leaks that might not be immediately visible. This involves pressurizing the cooling system and observing for leaks.
3. Coolant Leak Detection Dye: Adding a dye to the coolant can help locate leaks that are difficult to see visually. The dye will fluoresce under a UV light, making even small leaks easier to find.
4. Oil Inspection: Check the engine oil for signs of milky discoloration (indicative of coolant mixing with oil, a symptom of a head gasket leak).
It's crucial to avoid driving the Jeep with a significant coolant leak, as overheating can cause serious engine damage. A mechanic should diagnose the specific problem and perform the necessary repairs.
