sir i have chevrolet optra 2005 A/T. may engine cooling fan is not working when the AC is off. but when the AC in on it runs both.. the technician advice me to have a manual switch of the cooling fan. so if ever im not using the AC my engine not oveheat.. IS IT OKAY SIR? I notice both fan running slow than usaual even the AC in on.. and my aircon did not make enough cool..

thanks.. more power!