However, over time, several things can go wrong with it. If the fan does not come on, something in the control circuit is defective. Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. If the cooling fan motor burns out, the cooling fans will then, in turn be disabled. A wiring issue. If the cooling fan motors burn out or fail, the cooling fans will be disabled. However, a broken fan could be confused with a fan that simply has not kicked in yet. I turned on the A/C, then the defrost, and neither fan ran (I assume they run when A/C or defrost are on). Take a short piece of wire and jumper across this. 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. 1988 Reatta-How do I make my Radiator fan come on all the time when I turn on the car? The problem is when the car is up to operating temperature the fans dont come on at all. 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. 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. Report; Follow; Asked by Guru5WBJ Mar 26, 2017 at 02:02 PM about the 2006 Honda Civic EX. 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. Install engine splash shield and check cooling fan operation. These switches open when the set temperature is reached thus turning the fan(s) on. A temperature gauge on the dashboard may read high or a warning lamp may come on. 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. I was having an unrelated cooling system problem and while checking things out, decided to make sure the radiator fans were working. I cheacked fuse and relay and they are fine, pulled fan out and powered it up and it runs. Yes, the fan will come on when you turn the A/C on, so that proves the fan works. Hello I have a 2002 honda civic ex. Easiest. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Honda Accord Radiator Fan Issue. The coolant temp has to be hot for the fan to come on. If there’s an issue with the relay, the fan will be affected. A radiator fan has an important role of keeping a vehicle's engine cool. In other words, when I turn my key on, I want the radiator fan to come … This will make both cooling fans come on simultaneously, meaning less run time for both fans if the cooling system is in good condition. The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on. Cooling fans do not come on. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. The A/C condenser (the part which sits in front of the coolant radiator) is a heat exchanger. If the motor fails the blades will not be able to spin or generate air flow. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. The The fan relay controls the power to the cooling fan. Why dose my radiator fan come on when I start up my honda civic even though she is cold . The transmission slips because it is overheats. 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. 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. Locate the dark green/white wire at the relay connector. A radiator fan costs around $200 – $400. If this burns out or fails, you’ll need to replace it. Disconnect the negative battery terminal. Source: Ebay. See Contact Test in Step 1. Do the same with the Radiator Fan Relay. It overheats 4 notches about where it supposed to be. Make sure the horn still sounds. Question type: Maintenance & Repair. I just got done replacing my radiator and have every thing back to gether and radiator fan is not turning on. This cycles on and off for about a few minutes. Most Japanese cars have a normally closed switch. 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. In a nutshell: The radiator fan comes on so the A/C works at its highest efficiency. 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. 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. Take the Condenser Fan Relay and put it in place of the Horn relay. I jumped two relays so that they come on 24/7. 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. 1985-1989 Non B4P Optioned Corvettes. 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. Fan Clutch. 5. The (electric) fan only cools the water in the radiator, and is typically controlled by the temperature of the water in the radiator. 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 … If you turn the key on and your fan is good this will force the fan on. I want them to only come on when the ignition is on. Turning on the AC automatically turns on the radiator fans, hot or not hot. 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. 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 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: My car has an automatic transmission. 2. There are springs within the fan clutch that can wear out or corrode over the years. If the fan does not turn on, you will need to replace it. Install. My radiator fan comes on when I start my civic even though my car is cold. The radiator fan turns on at cold startup. Our temp switches essentiall complete the ground to make the fan come on. When it reaches that temperature; the switch closes and turns the fan(s) on. If you go the the harness plug that you unplug the radiator temp switch from there will be two blade connectors in there. The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. Incoming steam will "whip it up and throw it at incredibly high speeds into the radiator's inner walls." The cooling fans dont come on, and I want to know how to make them come on when I turn the key ON. The primary symptom of a bad radiator fan relay is an inoperative fan. 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. Run jumper wires between the connector's two electrical terminals. In addition, your mechanic would charge you $120 to $200 for labour cost depending on the make and model of your car. The fan is used to speed up the natural draft through the radiator/condenser or create one if the vehicle isn’t moving. 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