This month (October 2008) a differential cooler assembly is available for the 2009 Cadillac CTS-V. The part number is 20792934 (fig. 14).
The system is designed to reduce the operating temperature of the rear differential fluid when the CTS-V is driven at extended high speed or in competitive driving. The CTS-V differential cooler includes a temperature switch to operate the system when high rear differential fluid temperatures are met. The rear differential housing has provisions for the temperature switch. Installation time is less than 2 hours.
The differential lubricant pump and cooler assembly are located under the vehicle and are mounted to the rear storage compartment well (fig. 15). The cooler module assembly consists of a pump, a heat exchanger, an electric fan and assorted hoses/fittings.
All components except the external lines, temperature switch and fittings are located in the Cooler Module.
Oil is pulled from the differential and pumped through a hose to the cooler/heat exchanger. The differential oil is cooled by dissipating heat as the 12 volt electric fan blows outside air over the heat exchanger. The cooled differential oil then returns to the differential.
TIP: The pump and electric fan can be turned on using the temperature switch bypass plug included with the kit.
If the vehicle is equipped with this system, rear differential fluid capacity is an additional 0.31 L (0.33 qt).
- Thanks to Jeff Miller
July 2008 issue of GM TechLink.