One problem related to engine cooling system has been reported for the 1999 Porsche Boxster. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 1999 Porsche Boxster based on all problems reported for the 1999 Boxster.
Leaking coolant tank. The coolant tank on this vehicle has failed in numerous cars resulting in expensive repairs. Many owners I have contacted have experienced the same tank failure. I believe Porsche should fix these cars under a recall. This is clear case of a design deficency which will lead to overheating and failure of the engine. If this happens in traffic, the operater could be injured or killed. The tank must be replaced with an updated part from Porsche that has had the material changed.