* Intake manifold gasket: A leak here can cause coolant to seep into the engine. This is a fairly common failure point on many cars, and the location fits the mechanic's description. Repair cost can be moderate to high depending on labor rates in your area.
* Cylinder head gasket: This is a more serious problem. A blown head gasket can allow coolant to mix with engine oil or enter the cylinders. Repair is usually expensive and labor-intensive.
* Heater core: While usually located inside the car's dashboard, a leak *could* manifest as a drip somewhere in the engine bay depending on the routing of the heater core hoses. However, this is less likely given the mechanic's location description.
* Coolant passages in the engine block: A crack or corrosion in the engine block itself is possible, but less common than the other options. This is usually a very expensive repair, potentially requiring engine replacement.
Regarding cost:
* Water pump replacement: This is usually a moderate repair cost. Parts are relatively inexpensive, but labor can vary depending on your mechanic's rates and the difficulty of access. Expect to pay anywhere from $300 to $700.
* Intake manifold gasket replacement: This can range from $500 to $1000 or more depending on complexity and labor costs.
* Cylinder head gasket replacement: This is the most expensive option, potentially costing $1000 to $3000 or more.
* Engine block repair/replacement: This would be the most extreme and costly scenario. It could cost several thousand dollars.
Recommendation:
You need a more precise diagnosis. Ask the mechanic to:
1. Specifically identify the location of the leak: A photograph would be incredibly helpful.
2. Check for coolant in the engine oil: This helps rule out or confirm a head gasket problem.
3. Pressure test the cooling system: This can pinpoint the exact source of the leak.
Only after a thorough inspection can a reasonable repair estimate be provided. Getting a second opinion from another mechanic might be worthwhile, especially given the potential for high repair costs. Don't authorize any repairs until you have a clear understanding of the problem and the estimated cost.
