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. However, over time, several things can go wrong with it. You park your car, turn off the ignition and start walking away. Small cars typically have stacked AC and engine radiators cooled by a single fan. Paper, leaves, dust and debris or bent cooling fins blocking air from passing over the condenser will raise the temperature (and pressure) of refrigerant and result in … Check to make sure the radiator cooling fans are running when the AC is on. When the radiator fan does not work, this is a serious problem. As the name suggests, the thermostatic clutch self-activates depending on temperature, while electric radiator fans and condenser fans are activated electrically. 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. I see now that the condenser is in front of the radiator and both are of same dimension. 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. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Radiator fan testing points. I went junk yard I asked with guy same brand same motor . Operating the fan is a decision with many variables, and in a well-designed system it happens when hot outside and not moving, and perhaps after a delay (the radiator doesn't get hot immediately). If this burns out or fails, you’ll need to replace it. 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. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. Viscous radiator fans explained. My radiator fan seems to function properly while the AC is OFF. I left it for some time to allow the water cool down before looking for somewhere to park it. 2001 330Ci radiator suction fan won't turn off at all. The condenser fan usually has smaller blades and more of them. I realized it when the car overheated after fixing the pipe and refilling the coolant. Figure 3. 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. ... yes thats the sensor and it has two wires. I have same issue I'm driving Honda Accord 2003 model. Check for current from relay till the fan. 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). The cooling fan relay is the relay that controls the engine’s cooling fans. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. There are springs within the fan clutch that can wear out or corrode over the years. This article pertains to all vehicles. I was not aware that the fan was not working and thought that the pipe burst was the root cause of heating. 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. 2007 Silverado LT 4.8L new body style. When you run the AC the coolant fan comes on immediately and stays on. If the radiator fan is in working condition, move on to the next step. They are designed to only run when needed. I decided not to use the AC yesterday and the temperature gauge rose up. Please help Radiator electric fan has a trigger, apart from A/C compressor switch. When the A/C is on the primary cooling fan kicks on and the secondary cooling fan comes on at a temp of approx 210 as read from the dash board. There's two different controls of the fans, one is associated with the AC, the other with the engine coolant temperature. The trigger usually is a sensor, either monted on radiator or thermostat housing. Your car fan will run for a few minutes after you turn off the car then turn off. See Contact Test in Step 1. The condenser fan is the smaller of the two. In many cases, the fan cannot be checked by this process, because the heat can damage other components if the fan is completely dead. 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. The only way to stop the fan is to turn the car off. ac don't work and radiator fan don't work 11 Answers. Then you notice the engine cooling fan is still running even though the car is turned off. I had one fan which readaitor fan bad another A fan was working properly..radiator fan was not working anymore. Only time it works is if i unplug the coolant/Engine temperature sensor. 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. If there is voltage present there, a fault in the fan is the reason for the radiator fan not working. WIth a meter it looks like most everything checks out. On your yr crv I believe it is on the passenger side. Other cars the cut in range may be lower. I hope my comment was not misunderstood. 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 Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. If the fan does not turn on, you will need to replace it. OK so knowing which fan is which really helps. I also noticed the ac was not working. Chevy Aveo Radiator Fan Not Working Causes. The AC quit working and the car began to overheat. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. 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