Cooling System Problems Cause Head Gasket Failure on Subaru Impreza Outback

The head gasket has a high failure rate due to cooling system problems. Subaru is aware of the problem and has extended the warranty to 8 years/100k miles on many vehicles.

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Average mileage: 75,000 (75,000–75,000)
Engine affected: 2.5L 4 Cylinder
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004
8 people reported this problem
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problem details
2002 Subaru Impreza Outback - 2.5L 4 Cylinder 75,000 mi,
Began smelling the sweet smell of coolant burning as temps have dropped. Traced back to LH head, rear side. Dripping about 1 drop/min after shutting car down (until everything cools and the head-to-crankcase clearances join back up). This followed after a recent coolant servicing. Application of Subaru Coolant Conditioner as instructed by the WRP-99 seems to have abated the leak for the time being. Will be replacing head gaskets as soon as funds allow, as 8 yrs/100k miles was aptly chosen and we are now beyond that 8 yr limit!