In an actuator drive control device for an active vibration isolation support system, amplitudes of engine vibration are estimated when a front bank and a rear bank operate. The electromotive sunvisor assembly of a vehicle comprises an upper guide bar and a lower guide bar. The system implements the method. In an embodiment intended particularly to cool diesel engine exhaust for a turbocharger, a steel or stainless steel exhaust inletoutlet cap which is exposed to the high temperature exhaust is demountably attached to an all-aluminum heat exchange unit connected to the engine cooling system.