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. Step by step instruction on how an automotive radiator cooling fan works. Is there any wires I can jump in the fuse box? 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 … I checked the fuse and it's okay. However, over time, several things can go wrong with it. Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. The 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. The cooling fans dont come on, and I want to know how to make them come on when I turn the key ON. A wiring issue. Our temp switches essentiall complete the ground to make the fan come on. If the motor fails the blades will not be able to spin or generate air flow. Since the cooling fan motors work in tandem with the fan blades to pull air through the radiator, the blades will then not be able to spin or cause any airflow to cool off the car. Most fans should come on when the coolant reaches about 200 to 230 degrees. If so, a replacement fan costs upwards of $45. In order for the AC Condensor to do its job it must stay as cool as it can. >make his engine run cooler - changing the 'stat will do that. I turn on my A/C everyday here in Florida. A radiator fan costs around $200 – $400. Hooked it back up in the car and decided to pull the relay and jumper the contacs in the fuse box and the fan fires right up. The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on. In another scenario, trapped water can make the steam cool and condense rapidly. Route the cooling fan harness dark green or blue wire to the main fan relay (near the battery). 1988 Reatta-How do I make my Radiator fan come on all the time when I turn on the car? 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. If the fan does not come on, something in the control circuit is defective. Honda Accord Radiator Fan Issue. Onto my point. Defective fan relay. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. I want them to only come on when the ignition is on. I was having an unrelated cooling system problem and while checking things out, decided to make sure the radiator fans were working. 2. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. See Contact Test in Step 1. A temperature gauge on the dashboard may read high or a warning lamp may come on. The radiator fan turns on at cold startup. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. 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. The length of time cycling on and off seems to correlate to the temperature. Fan Clutch. Hello I have a 2002 honda civic ex. The primary symptom of a bad radiator fan relay is an inoperative fan. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. I have a 1999 Chevy Malibu. The problem is when the car is up to operating temperature the fans dont come on at all. But since most drivers are not paying attention to if and when the radiator fan is running, the symptom more likely to be noticed is an engine that is running hotter than normal or is overheating. Yes, a broken radiator fan can cause the air conditiong to stop working. The radiator fan itself may be faulty. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Faulty wiring could be to blame. Source: Ebay. 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. The coolant temp has to be hot for the fan to come on. > No! Locate the dark green/white wire at the relay connector. 1985-1989 Non B4P Optioned Corvettes. If you go the the harness plug that you unplug the radiator temp switch from there will be two blade connectors in there. Most Japanese cars have a normally closed switch. If this burns out or fails, you’ll need to replace it. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. A radiator fan has an important role of keeping a vehicle's engine cool. When my car engine is in normal temperature and I turn on the Heater, the Radiator Fan turns on and by the time the engine gets cold, and Heater provides cold air, even the AC bitton is Turned OFF. Also Know, does radiator fan affect AC? Make sure the horn still sounds. This will make both cooling fans come on simultaneously, meaning less run time for both fans if the cooling system is in good condition. 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. The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. This article pertains to all vehicles. My radiator fan comes on when I start my civic even though my car is cold. It may cause the fan to cut in and out, or not come on at all. Why dose my radiator fan come on when I start up my honda civic even though she is cold . I have replaced both temperature switches and that still didnt work. Install engine splash shield and check cooling fan operation. I just got done replacing my radiator and have every thing back to gether and radiator fan is not turning on. Report; Follow; Asked by Guru5WBJ Mar 26, 2017 at 02:02 PM about the 2006 Honda Civic EX. Run jumper wires between the connector's two electrical terminals. Radiator Fan Replacement Cost Radiator fan replacement cost ranges between $300 to $700. 1. Take the Condenser Fan Relay and put it in place of the Horn relay. At this point the fan should come on. Start your vehicle, and let it idle for 10-15 minutes. If the fan does not turn on, you will need to replace it. It should >also make the fan come on earlier, too, shouldn't it, to help cool the >engine? If you turn the key on and your fan is good this will force the fan on. Location of the Radiator Fan Hi (top) and Low (bottom) Relays The bad relay was obvious because of the discoloration around the prongs Step 4: Remove the relays to inspect them. When the radiator fan does not work, this is a serious problem. These switches open when the set temperature is reached thus turning the fan(s) on. Cooling fans do not come on. Disconnect the negative battery terminal. Conclusion Easiest. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. If everything else seems to be fine, the fan clutch is the most likely cause of radiator fan failure. Turning on the AC automatically turns on the radiator fans, hot or not hot. The fan relay controls the power to the cooling fan. If fan is giving you a hard time and will not drop all the way down, check to see if bottom of cooling fan is hung up on radiator or hoses. I jumped two relays so that they come on 24/7. My car has an automatic transmission. The fan is used to speed up the natural draft through the radiator/condenser or create one if the vehicle isn’t moving. Yes, the fan will come on when you turn the A/C on, so that proves the fan works. Leave the A/C off for the rest of the test. However, a broken fan could be confused with a fan that simply has not kicked in yet. The (electric) fan only cools the water in the radiator, and is typically controlled by the temperature of the water in the radiator. If the cooling fan motors burn out or fail, the cooling fans will be disabled. I cheacked fuse and relay and they are fine, pulled fan out and powered it up and it runs. Incoming steam will "whip it up and throw it at incredibly high speeds into the radiator's inner walls." If the cooling fan motor burns out, the cooling fans will then, in turn be disabled. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. In other words, when I turn my key on, I want the radiator fan to come … Once the vehicle has reached a speed of around 25mph/40kph the air flow through the radiator will exceed what the fan can flow, so the fan is not required to operate above these speeds. Question type: Maintenance & Repair. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. It overheats 4 notches about where it supposed to be. Ever. There are springs within the fan clutch that can wear out or corrode over the years. Reroute wiring harness and connect. This cycles on and off for about a few minutes. Install. When it reaches that temperature; the switch closes and turns the fan(s) on. I have re assembled most of the radiator and fan which is fiddly and just have the expansion tank, air cleaner and under plastics to fit, waiting for a new O ring for the expansion tank as it leaked at the slightest movement when taking it off, Jag don't list it as a spare part, it has a 22mm inner diameter and a cross section of 3.5mm giving an od of 29mm, found some on ebay. Related Cooling Fan Stays On Content 1999 Buick Regal Cooling Fans They Do Not Come On At All, Even When Turning Ac On That Does Not Come On Either.I Have … Naturally I looked to see if the fans were working. The radiator fan on a Saturn should give you years of trouble-free performance. If there’s an issue with the relay, the fan will be affected. If the fan … 5. To check this, unplug the single wire connector and, using a jumper wire, ground it. 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. Take a short piece of wire and jumper across this. 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: Do the same with the Radiator Fan Relay. In addition, your mechanic would charge you $120 to $200 for labour cost depending on the make and model of your car. I turned on the A/C, then the defrost, and neither fan ran (I assume they run when A/C or defrost are on). X Research source Check to make sure each of the bolts holding the fan clutch in place is secure and intact. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. The transmission slips because it is overheats. If the horn does not sound for either of these (or the horn sounds constantly as soon as the relay is installed), replace that relay. 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