When the radiator fan does not work, this is a serious problem. Question type: Maintenance & Repair. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Hello I have a 2002 honda civic ex. On a functional fan clutch, the fan blades will all be lined up neatly inside the housing, which should sit upright with an equal amount of space between the radiator and engine. Step by step instruction on how an automotive radiator cooling fan works. I turned on the A/C, then the defrost, and neither fan ran (I assume they run when A/C or defrost are on). This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. If the cooling fan motors burn out or fail, the cooling fans will be disabled. To check this, unplug the single wire connector and, using a jumper wire, ground it. Without the rotating mass of the fan, your engine gets better fuel economy too (not that we are that concerned with that).“These LS engines didn’t even come set up for a mechanical fan, so it was simply a matter of making a radiator and electric fan combination that bolted into the classic body,” Saffell says. My radiator fan comes on when I start my civic even though my car is cold. I jumped two relays so that they come on 24/7. Reroute wiring harness and connect. If air isn't flowing over it, it won't exchange the heat it needs get rid of so the A/C core inside the vehicle can become cold and make … If the fan does not turn on, you will need to replace it. The (electric) fan only cools the water in the radiator, and is typically controlled by the temperature of the water in the radiator. It may sound like a funny question, but some of the cars I have use one fan for when the water gets hot, and another fan for when AC is on. I pulled out them each and realized that they are both identical and by looking at them I could tell that the one pictured below was likely bad because of the discoloration, which is most likely from over heating: 1. Take the Condenser Fan Relay and put it in place of the Horn relay. A temperature gauge on the dashboard may read high or a warning lamp may come on. The Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. Source: Ebay. 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. Install engine splash shield and check cooling fan operation. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. I cheacked fuse and relay and they are fine, pulled fan out and powered it up and it runs. I even got a wire and shorted the pins in the sensor next to the thermostat as normally they will run when you do that, but nothing happened. Incoming steam will "whip it up and throw it at incredibly high speeds into the radiator's inner walls." Report; Follow; Asked by Guru5WBJ Mar 26, 2017 at 02:02 PM about the 2006 Honda Civic EX. 5. A manual fan is connected to the engine drive pulleys and is controlled by a thermo fan clutch which senses radiator heat and engages when the engine is running at higher temperatures. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the cooling fan motor burns out, the cooling fans will then, in turn be disabled. I want them to only come on when the ignition is on. If everything else seems to be fine, the fan clutch is the most likely cause of radiator fan failure. This article pertains to all vehicles. The radiator fan itself may be faulty. A radiator fan costs around $200 – $400. Our temp switches essentiall complete the ground to make the fan come on. Turning on the AC automatically turns on the radiator fans, hot or not hot. Run jumper wires between the connector's two electrical terminals. This cycles on and off for about a few minutes. The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. I have replaced both temperature switches and that still didnt work. Faulty wiring could be to blame. At high motor vehicle speeds the ram effect through the air is usually sufficient enough to cool the radiator/condenser core so the fan is not required. Fan Clutch. If you go the the harness plug that you unplug the radiator temp switch from there will be two blade connectors in there. At this point the fan should come on. In order for the AC Condensor to do its job it must stay as cool as it can. It overheats 4 notches about where it supposed to be. Honda Accord Radiator Fan Issue. The fan relay controls the power to the cooling fan. 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