That is where the current needs to flow. I had one fan which readaitor fan bad another A fan was working properly..radiator fan was not working anymore. Viscous radiator fans explained. The cooling fan relay is the relay that controls the engine’s cooling fans. This article pertains to all vehicles. It was the radiator fan that I could start with my fingers when AC was on. 2001 330Ci radiator suction fan won't turn off at all. Then you notice the engine cooling fan is still running even though the car is turned off. Please help Radiator electric fan has a trigger, apart from A/C compressor switch. When there is not enough air flow through the radiator, this causes blockage in the fins, and as a result, the car overheats when AC is on. However, over time, several things can go wrong with it. There are a few simple reasons that the fan would not be cycling on. I also noticed the ac was not working. 1996 Grand Prix se 3.1 L. The car is over heating when the A/C is turned off and the cooling fans do not seem to come on. I went junk yard I asked with guy same brand same motor . Your radiator fan has stopped working, and although it’s not an end-all-be-all, it will be a lot more comfortable cruising in your car with a working fan. Chevy Aveo Radiator Fan Not Working Causes. Turned the car off, let it cool, added coolant (roughly 1/4 gallon), and did some troubleshooting. The AC quit working and the car began to overheat. My radiator fan seems to function properly while the AC is OFF. Faulty fan: Is your car overheats when ac is on and idle? Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. They are designed to only run when needed. Other cars the cut in range may be lower. WIth a meter it looks like most everything checks out. I tested found readitor fan motor is bad. 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. Low Voltage Fans may fail to engage if the car's system voltage is too low, as might be the case with a failing alternator. If the AC is off, and the coolant temperature gets too high, the radiator fans will be turned on. Car has overheated because ... (called light off) the better the cars emissions will be. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. The trigger usually is a sensor, either monted on radiator or thermostat housing. I realized it when the car overheated after fixing the pipe and refilling the coolant. AC Condenser. There are springs within the fan clutch that can wear out or corrode over the years. Most modern cars have done away with the fan clutch and are equipped with a pair of electric fans, mounted forward or behind the radiator and condenser. If the fan does not turn on, you will need to replace it. Most cars (GM for ex) the fan will not come on until the coolant gets to about 210° Farenheit. When you run the AC the coolant fan comes on immediately and stays on. I left it for some time to allow the water cool down before looking for somewhere to park it. If they dont come on with the AC, then you need to check the 30A RDI FAN located in the fuse box by the battery. Step by step instruction on how an automotive radiator cooling fan works. Figure 3. Small cars typically have stacked AC and engine radiators cooled by a single fan. Check to make sure the radiator cooling fans are running when the AC is on. In most cases, the car overheats when AC is on but at low speed or stationary. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. I was not aware that the fan was not working and thought that the pipe burst was the root cause of heating. 2006 ION 2.2L. If everything else seems to be fine, the fan clutch is the most likely cause of radiator fan … On your yr crv I believe it is on the passenger side. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Radiator Fan Relay stuck open They have a Symptom Troubleshooting Index line for just the opposite... i.e.Both fans run on low, the radiator fan runs on high, condenser fan does not run on high and they have you look at fuse #9 and #30. The condenser fan usually has smaller blades and more of them. This issue occurs when there is not enough airflow through the radiator. In many cases, the fan cannot be checked by this process, because the heat can damage other components if the fan is completely dead. The radiator fan on a Saturn should give you years of trouble-free performance. If there is voltage present there, a fault in the fan is the reason for the radiator fan not working. I decided not to use the AC yesterday and the temperature gauge rose up. ... yes thats the sensor and it has two wires. It does not turn on, when A/C is turned on ( I realized AC is also not working on my car, it may be related or not). On many Hondas, both fans turn on when the AC is first turned on and the compressor is running and temp set to low and heater/AC fan turned on. If your car's fan does not turn freely by hand when the engine is off, then the fan motor is seized and needs to be replaced. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. There's two different controls of the fans, one is associated with the AC, the other with the engine coolant temperature. The radiator fan will not work, thus the overheating. when the coolant is below 181 degrees F the switch should be closed to turn off the fans. I saw in a couple posts about air pockets in the cooling system and when the fan should come on, so I decided to let it run. The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. THe fan actually came on at … When the AC is on, the condenser fan automatically turns on when a high temperature is reached to cool the condenser and when the optimum temperature is reached, the fan automatically turns off. Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. See Contact Test in Step 1. immediately the ac went off … That depends on the car. READ MORE. Check for current from relay till the fan. Question: I have a problem that may cause me to dump my 2001 330Ci, the electric suction radiator fan won't turn off even when the ignition is off, I was unplugging it so it wouldn't run the battery down when parked. When the radiator fan does not work, this is a serious problem. 1996 Chevy Cavalier 2.2 lt engine. The only way to stop the fan is to turn the car off. It is then, the fan that you will need to replace. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. The condenser fan is the smaller of the two. Radiator fan testing points. If this burns out or fails, you’ll need to replace it. If the radiator fan is in working condition, move on to the next step. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. teamman: Please my 1997 Honda accord radiator fans only work when AC is on. Your car fan will run for a few minutes after you turn off the car then turn off. I hope my comment was not misunderstood. You will be able to locate the fan relay under the hood. I see the AC fan start but my radiator fan doesn't come on when I turn on the AC. Looking down from the top I did not see the two and was figuring that it was all radiator. 2007 Silverado LT 4.8L new body style. Only time it works is if i unplug the coolant/Engine temperature sensor. Unplug the radiator fan connector. ac don't work and radiator fan don't work 11 Answers. You can turn off the AC completely and the radiator fan will continue to run. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Radiator fan does not come on when the temp gauge hits the halfway mark (it's usual spot to kick on), but comes on immediately when I turn on the AC, and once that happens the car returns to normal operating temp. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. 2008 chevy Silverado 4.8 cooling fans only work when ac is on , the temp will start creeping up when ac is off , I have already replaced thermonstat and the sensor on the front of motor on left side has not corrected the trouble, any suggestions Cooling Fan Not Working with AC On Thanks for the diagram! Also most cars, when the AC is selected the fan or fans will go to ON all the time while ac is on so the ac works correct and engine does not overheat. Run jumper wires between the connector's two electrical terminals. How You Can Replace A Radiator Hose; 3. I decided to check the fan because it was supposed to come on at 90° to my surprise the fan was not. It does not cycle on and off as the compressor kicks on and off. 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