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The best thing I like about them is I have them set to run even after I shut the engine down. Depending on the day they may cycle twice after the truck is sitting. They do a good job of cooling that old big block down.
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Unless you have it connected to an electric waterpump too, you are just cooling the radiator. Not that it is a bad thing, but the effect on the engine itself is minimal and even then it is more likely that just the fact that the air is moving under the hood is doing more for you.
The downside is that if the relay should happen to stick..........dead battery.