Heater core leaks are common in this model, more so if the wrong anti-freeze/coolant is used in the cooling system.
2009 Volkswagen Jetta Problem Reports
RepairPal Verified 2009 Volkswagen Jetta Problem Reports
Electrical issues that are difficult to diagnose—and sometimes intermittent—are typically due to ground wiring issues. The most troublesome ground locations are under the battery or at the engine.
Condensation in the heater case may cause a musty odor from the heating, ventilation and AC (HVAC) system after sitting for two hours or more. Our technicians tell us that a cleaner is available for the heater case and the drain system should be checked for debris.
Reverse gear failures and noise in the manual transmission models are common.
The rear brakes tend to wear out quickly; rotors may need replacement by the first brake job. Our technicians recommend that the brakes be inspected for wear regularly.
One or more power windows may fail. Our technicians tell us this is commonly due to a failed window regulator which will require replacement.
Shifting issues due to internal problems in high mileage automatic transmissions can be difficult to resolve without transmission replacement.