The EcoPower 30x30x10mm High Speed HV Cooling Fan is a great option to keep your ESC and motor temps in check.  

NOTE: This fan should be installed at least 5mm away from the motor to allow sufficient air flow and prevent magnet interference. 

Features:

• 30mm cooling fan
• Ideal for ESC and motor applications
• Compatible with 2S HV LiPo systems (8.75V max)
• Perfect for 1/12, 1/10 and 1/8 scale platforms   
• 2 pin JST connector