Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. In many cases, the fan cannot be checked by this process, because the heat can damage other components if the fan is completely dead. and he installed that I thought I have Done the issued clear. 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. Viscous radiator fans explained. Had a problem with the Air conditioner (AC) radiator cooling fan in my VW Polo 9N, 2003. 2001 330Ci radiator suction fan won't turn off at all. I was not aware that the fan was not working and thought that the pipe burst was the root cause of heating. OK so knowing which fan is which really helps. radiator fan not working. 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. 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. I have same issue I'm driving Honda Accord 2003 model. I see the AC fan start but my radiator fan doesn't come on when I turn on the AC. THe fan actually came on at â¦ The radiator fan on a Saturn should give you years of trouble-free performance. The condenser fan is the smaller of the two. Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. The trigger usually is a sensor, either monted on radiator or thermostat housing. I hope my comment was not misunderstood. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). 1996 Chevy Cavalier 2.2 lt engine. When the radiator fan does not work, this is a serious problem. If the AC is off, and the coolant temperature gets too high, the radiator fans will be turned on. when the coolant is below 181 degrees F the switch should be closed to turn off the fans. 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 2.4ltr 4 cylinder. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. That is where the current needs to flow. I tested found readitor fan motor is bad. Run jumper wires between the connector's two electrical terminals. I left it for some time to allow the water cool down before looking for somewhere to park it. The condenser fan usually has smaller blades and more of them. Check to make sure the radiator cooling fans are running when the AC is on. 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. 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. If this burns out or fails, youâll need to replace it. You can turn off the AC completely and the radiator fan will continue to run. 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. Then you notice the engine cooling fan is still running even though the car is turned off. There are springs within the fan clutch that can wear out or corrode over the years. Step by step instruction on how an automotive radiator cooling fan works. Small cars typically have stacked AC and engine radiators cooled by a single fan. Only time it works is if i unplug the coolant/Engine temperature sensor. immediately the ac went off â¦ Your radiator fan has stopped working, and although itâs not an end-all-be-all, it will be a lot more comfortable cruising in your car with a working fan. My radiator fan seems to function properly while the AC is OFF. ... yes thats the sensor and it has two wires. This issue occurs when there is not enough airflow through the radiator. 2007 Silverado LT 4.8L new body style. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. Turned the car off, let it cool, added coolant (roughly 1/4 gallon), and did some troubleshooting. Figure 3. The AC quit working and the car began to overheat. Just because the radiator fan is not on does not mean that it is not working. Unplug the radiator fan connector. I went junk yard I asked with guy same brand same motor . 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. They are designed to only run when needed. Looking down from the top I did not see the two and was figuring that it was all radiator. I had one fan which readaitor fan bad another A fan was working properly..radiator fan was not working anymore. Cooling Fan Not Working with AC On Thanks for the diagram! There's two different controls of the fans, one is associated with the AC, the other with the engine coolant temperature. In most cases, the car overheats when AC is on but at low speed or stationary. Radiator fan testing points. Other cars the cut in range may be lower. 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). See Contact Test in Step 1. The cooling fan relay is the relay that controls the engineâs cooling fans. 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. 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. 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 â¦ 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. You will be able to locate the fan relay under the hood. It is then, the fan that you will need to replace. If the radiator fan is in working condition, move on to the next step. Car has overheated because ... (called light off) the better the cars emissions will be. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. 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 everything else seems to be fine, the fan clutch is the most likely cause of radiator fan â¦ 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. On your yr crv I believe it is on the passenger side. There are a few simple reasons that the fan would not be cycling on. When moving, there is natural airflow, so the radiator fan should be unnecessary. Your car fan will run for a few minutes after you turn off the car then turn off. This article pertains to all vehicles. The point is that over heating can be because of multiple reasons and is always tricky to solve. WIth a meter it looks like most everything checks out. 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). Of course, not all radiator fans are electrically operated, and a large percentage of vehicles use radiator fans that are driven through viscous couplings. The only way to stop the fan is to turn the car off. That depends on the car. 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. If there is voltage present there, a fault in the fan is the reason for the radiator fan not working. It does not cycle on and off as the compressor kicks on and off. If the fan does not turn on, you will need to replace it. Check for current from relay till the fan. 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. It was the radiator fan that I could start with my fingers when AC was on. I realized it when the car overheated after fixing the pipe and refilling the coolant. I see now that the condenser is in front of the radiator and both are of same dimension. teamman: Please my 1997 Honda accord radiator fans only work when AC is on. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Faulty fan: Is your car overheats when ac is on and idle? The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. Chevy Aveo Radiator Fan Not Working Causes. 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. AC Condenser. Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. Most cars (GM for ex) the fan will not come on until the coolant gets to about 210° Farenheit. 2006 ION 2.2L. If your Aveo is running hot, and the fan is not running weâve laid out the most common causes of this issue below. How You Can Replace A Radiator Hose; 3. As the name suggests, the thermostatic clutch self-activates depending on temperature, while electric radiator fans and condenser fans are activated electrically. I decided to check the fan because it was supposed to come on at 90° to my surprise the fan was not. I also noticed the ac was not working. 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. READ MORE. However, over time, several things can go wrong with it. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. ac don't work and radiator fan don't work 11 Answers. 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. You park your car, turn off the ignition and start walking away. When you run the AC the coolant fan comes on immediately and stays on. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. The radiator fan will not work, thus the overheating. Car, turn off at all 'm driving Honda accord radiator fans and condenser fans are running when coolant. Condenser fan usually has smaller blades and more of them water cool down before looking somewhere! Have stacked AC and engine radiators cooled by a single fan with AC Thanks. 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