Okay so is their a way to check the Radiator “fuse” if its getting power whatever what it is because its this black box looking thing doesnt look like a regular fuse. But i want to test it to make sure its not bad, because i was having problems with overheating on the highway and checked my coolant this morning and it actually was low. But as i was filling up the system and allowing it to burp the air bubbles for about 20 min with the heater on Max. But only my Ac fan came on and not the big radiator fan next to it. Would this cause overheating on the highway tho? Because going 70mph i would think the car is getting lots of air to cool it down at those speeds even without the fan. So how can i check this black box “fuse” for the radiator if its good or not?