Additional 20W Coolant Pump

An additional electric coolant pump with a power of 20 W balances the different pressure losses between the APM and PEB. Coolant flows through the APM and PEB in parallel with one another but because the PEB generates more heat than the APM, this means that a larger cooling surface needs to be made available in the PEB, which brings with it a higher flow resistance and higher pressure losses. Without special measures, the coolant would mainly flow via the lower flow resistance of the APM. A restriction in the APM partly balances this, but not completely. The additional 20 W coolant pump is responsible for the rest.