Cooling

19 - Cooling







Due to the increase in power of the new Boxster (987) and Boxster S (987) models and the resultant higher thermal load, the cooling system had to be revised. The Boxster and Boxster S with manual transmission are equipped with two radiators from the 911 Carrera (997).

Similar to the previous Boxster (986) models, the new Boxster (987) radiators are mounted in the front fenders in front of the front wheels. These radiators have been enlarged in terms of both surface area (approx. 5 %) and depth (approx. 20 %). The two powerful electric fans also include a control system designed to meet the cooling requirements in conjunction with a modified exhaust air concept. This ensures flow optimized control of the exhaust air flow and aerodynamic optimization of the cooling system. This new feature permits infinite control of the fan speed as a function of the coolant temperature and the system pressure in the air conditioning system instead of two-stage control. It has the advantages of requiring less current and therefore creates less of a load on the vehicle electrical system, in addition to quieter operation.

The coolant pump is identical to that used on the 911 Carrera (997) and ensures a higher coolant flow rate. The more efficient operation means that the smaller oil/water heat exchanger of the Boxster (987) 2.7 liter engine can now be used on the Boxster S (987) as well, resulting in a weight reduction of 12.7 oz (360 g).

The Boxster S (987) with Tiptronic S features an additional radiator at the front of the vehicle. This enables cooling of the automatic transmission oil via an additional oil/water heat exchanger in a common coolant circuit.