What about to use the existent car cooling liquid to refrigerate the servos aluminum block? Another simple suggestion is the use of a 12V small fan (inside the aluminum block) to force air through some holes. There is also some special filters that block infra-red, could be used to avoid receive direct heat from engine and exhaust. I really never understood why the radiator fan just take the heat from the cooling liquid and blow it back over the engine... ... probably because the external air is cool, the heat from the cooling liquid heat the air, but not so much as the external engine temperature, so that hot air helps to refrigerate in someway the engine... is that right? Wagner. Jon Petty wrote: > > Hello > > Does anyone know if there are high temp rc type servos. I am using an > Airtronics heavy duty servo in a motor vehicle application that is mounted > under the hood. The servos are mounted in an aluminum enclosure, but they are > subject to the underhood heat from the radiator, engine and exhaust. The > servos have been doing all right, but the recent ambient 110 deg F. temps in > Phoenix have increased servo exposure to temperatures well above 250 degrees > F and they have started failing. > > Any ideas or suggestions? > > Thanks > > Jon