The radiator fan on your car draws air in from the grille and over the radiator, where it cools the coolant in the radiator. Also, it's important to take a look at possibilities of why a 30A fuse blew. I am a bit worried that the only radiator will not be working either in a minute! F. This is the switch that will keep the cooling fan running after the … Is that normal? It overheats yes & all the fuses are good even the car sensor is good too. Mar 27, 2011 #3 B. Burnout124 Member. Only do this if you have a sound knowledge in electrics. Thanks One radiator not working. Hi This is puzzling me! Just in case you're seeing one fan on with the AC. One of the radiator fans not working. According to GM, that is how they are supposed to work. Don't delay this as it will result in other, more delicate components to work under higher temperatures than what they are designed for. If the valves are open but the radiator is still cold, it’s possible that the valves are blocked. Have you checked the fuses? the second fan should come on then. I noticed only one fan working now. Mechanic's Assistant: What is the model/year of your Kia? The Toyota's fan only turns on when the coolant reaches a certain temperature, which is measured by a sensor. In the absence of a fan, air still flows in, usually directed by the shroud. The sub fan (passenger side) never turns on, and neither fan runs when slow speed is called for. Posts : 19. window 10 home . Am I right in thinking there is air in the system? Posted by sunil noronha on Aug 14, 2018 Want Answer 1 Fan motor failure. Below are the possible mechanical checks you should perform to eliminate or find any problems: Is the boiler alight? The boiler only comes on for a few minutes then goes off. This sensor switches the cooling fan off and on as needed. Thread Starter New 18 Feb 2018 #11. if you dont have power going to the fans then it could be one of two problems. Checked the relays, only found 3 of them, still not working. 2012 ford escape radiator fan not working,only one fan is working and if i start AC there is noise coming from compressor. Fan Clutch. NO RADIATORS WORKING? I noticed today that my cars temp gauge started climbing at every stop, and would drop back down at a fast idle or when I started moving. the radiator fan doesn't work unless the AC is on. If everything else seems to be fine, the fan clutch is the most likely cause of radiator fan failure. The blower motor for the heater is a great one to check. Afterthought: Is the radiator a crossflow or downflow? If the radiator fan is in working condition, move on to the next step. when the coolant temperature sensor, located on the radiator, opens and FAN relay #1 and FAN … Unplug the radiator fan connector. They are designed to only run when needed. Joined I believe (not certain) that with the crossflow radiators, only one fan will come on if the engine coolant temperature is low but the AC is on. Mechanic's Assistant: Has the car been overheating? If it does not, then you may have a fault. By: ... try turning your air conditioning on when the one fan is working. 2003 Kia Optima I was only able to find one relay, in the fuse box, looking from the driver fender it is the right side 3 from the top, the bottom right being the blower motor for the heater. The temp gauge works fine, and the passengers side fan ( the one that turns on with the a/c ) works but only when the a/c is running. Just because the radiator fan is not on does not mean that it is not working. Jump to page: winhelper. If the radiator fan is not working, it’s a serious problem. Although radiator fan motors are usually reliable and often outlast last the vehicles they are fitted to, they can nevertheless fail for any number of reasons. 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