The radiator fan will not work, thus the overheating. You will be able to locate the fan relay under the hood. 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. 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 Only time it works is if i unplug the coolant/Engine temperature sensor. Your car fan will run for a few minutes after you turn off the car then turn off. See Contact Test in Step 1. READ MORE. I see now that the condenser is in front of the radiator and both are of same dimension. The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. The fan helps cool off the radiator, which acts as a heat sink drawing heat away from the engine. 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. 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. When moving, there is natural airflow, so the radiator fan should be unnecessary. AC Condenser. 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. I tested found readitor fan motor is bad. Figure 3. It does not cycle on and off as the compressor kicks on and off. I left it for some time to allow the water cool down before looking for somewhere to park it. Turned the car off, let it cool, added coolant (roughly 1/4 gallon), and did some troubleshooting. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. THe fan actually came on at … Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. They are designed to only run when needed. Unplug the radiator fan connector. If the radiator fan is in working condition, move on to the next step. I hope my comment was not misunderstood. 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. In most cases, the car overheats when AC is on but at low speed or stationary. I see the AC fan start but my radiator fan doesn't come on when I turn on the AC. OK so knowing which fan is which really helps. Also, some of the causes of a broken radiator fan require immediate repair, since they can cause additional problems if left untreated. 2007 Silverado LT 4.8L new body style. I have same issue I'm driving Honda Accord 2003 model. I went junk yard I asked with guy same brand same motor . If the AC is off, and the coolant temperature gets too high, the radiator fans will be turned on. If there is voltage present there, a fault in the fan is the reason for the radiator fan not working. ... yes thats the sensor and it has two wires. 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. The cooling fan relay is the relay that controls the engine’s cooling fans. Check for current from relay till the fan. 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. However, over time, several things can go wrong with it. 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 … and he installed that I thought I have Done the issued clear. 2.4ltr 4 cylinder. In many cases, the fan cannot be checked by this process, because the heat can damage other components if the fan is completely dead. Faulty fan: Is your car overheats when ac is on and idle? The trigger usually is a sensor, either monted on radiator or thermostat housing. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). 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. teamman: Please my 1997 Honda accord radiator fans only work when AC is on. Then you notice the engine cooling fan is still running even though the car is turned off. Just because the radiator fan is not on does not mean that it is not working. Cooling Fan Not Working with AC On Thanks for the diagram! It was the radiator fan that I could start with my fingers when AC was on. 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. Looking down from the top I did not see the two and was figuring that it was all radiator. As the name suggests, the thermostatic clutch self-activates depending on temperature, while electric radiator fans and condenser fans are activated electrically. when the coolant is below 181 degrees F the switch should be closed to turn off the fans. I also noticed the ac was not working. The radiator fan on a Saturn should give you years of trouble-free performance. If this burns out or fails, you’ll need to replace it. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. There's two different controls of the fans, one is associated with the AC, the other with the engine coolant temperature. 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. radiator fan not working. Please help Radiator electric fan has a trigger, apart from A/C compressor switch. On your yr crv I believe it is on the passenger side. The point is that over heating can be because of multiple reasons and is always tricky to solve. I decided to check the fan because it was supposed to come on at 90° to my surprise the fan was not. I decided not to use the AC yesterday and the temperature gauge rose up. That is where the current needs to flow. 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. 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