Can I run my electric fan all the time when the engine is running? What are the down sides? I've tried using a Perma Cool temp control switch with a radiator sensor and it failed to kick the fan on...Perma cool replaced it and the new one wouldn't work either. So I hooked up the fan to run whenever the engine was on...I did use a pretty large relay however... The engine is a 350/330HP with an alternator/serpentine system and it does tend to run hot. With the fan on all the time temp stays about 180 degrees.
