Scotty Kilmer Diagnoses Coolant Leak and Advises on Keeping a High-Mileage Chevy Malibu

Diagnosing a Coolant Leak

• 💡 The video addresses a common car problem: losing coolant without an obvious visible leak, using a 2011 Chevy Malibu with 160,000 miles as an example.
• 🛠️ The first step in diagnosis is to check the radiator cap, which had already been replaced by the owner without resolving the issue.
• 🔬 A pressure test of the cooling system is recommended, using a specialized adapter for GM vehicles, to identify leaks.
• 💧 The system was pressurized to 15 PSI, and after a brief wait, a drip was observed originating from the bottom of the water pump.

Water Pump Replacement and Cost

• 📍 The diagnosis confirmed a leaking water pump as the source of the coolant loss.
• 💰 The cost for a new water pump is $361, with an estimated four hours of labor, leading to a total of $4349 if done by a dealership.
• 🔧 Scotty suggests that this is a manageable DIY repair or can be done by a competent mechanic in under 1.5 hours, advising to shop around for better labor rates.
• ⚙️ The water pump on this model is belt-driven and does not require electronic reprogramming, making it a straightforward replacement.

Vehicle Health and Decision to Keep

• 🚗 After addressing the coolant leak, the car is scanned for diagnostic trouble codes, revealing only two related to the airbag system, which is considered good for its age.
• 📊 Live data from the engine control module shows perfect fuel trims and a functioning mass airflow sensor, indicating the engine is in good mechanical shape.
• 🛣️ The owner's previous use of fuel injector and oil cleaners, combined with extensive highway driving, has contributed to the engine's excellent condition.
• ✅ Based on the diagnostics and the car's overall health, Scotty advises the owner to keep the car, especially given its low acquisition cost and the owner's reluctance to buy a new car.

Additional Findings and Recommendations

• ⚠️ The car exhibits a worn right rear wheel bearing, indicated by a noise during driving, but this is not an immediate safety concern.
• 💨 Struts are noted as slightly worn, causing a bit of bounciness, but not enough to cause premature tire wear.
• 🚫 The transmission fluid has likely never been changed, but due to the extensive highway driving, it remains in good working order and changing it now is not recommended.
• 🔧 Regular oil changes every 5,000 miles are advised for continued longevity.