Subarus and Overheating Problems

Overheating problems have been seen in Subarus from the late 1990s and the 2000s. These problems are not terminal by themselves, but they can lead to catastrophic engine damage if they're not fixed in their early stages.

Identification

• Faulty head gaskets are at the root of many overheating problems in Subarus, according to the Smart Service website. These problems are most common in Phase 1 2.5-liter engines in 1996 to 1999 Outbacks and 1996 to 1999 Lecacy GTs. These engines are also in the 1998 Impreza RS.

Diagnosis

• Diagnosing a head gasket failure can not be done without disassembling the Subaru's engine. However, you can buy an engine block leak detector at your local auto parts store if you think your head gasket may be faulty. Detecting a leak will give your mechanic a better idea of whether or not the head gasket is the problem.

Considerations

• Other problems may be causing your Subaru to overheat. Accumulated deposits in the engine's water jackets or a defective thermostat can cause an overheating problem. A slipping fan clutch or poor airflow through the radiator are other possible causes.