If the belt/viscous clutch fan is moving enough air (assuming your car has auto transmission), electric fan won't run. Yes, you can drive your car without a radiator fan, but you never should. Likewise, why does my radiator fan turn on and off? If the compressor is running long enough to build heat in the high side of the system, and the cooling fans don’t turn on, I would begin finding the fan relays and add power to the appropriate circuit to see if the fans turn on at all. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator. I will of course check to see if the radiator fan comes on when i start the car in the morning when cold to rule anything else out ( as i've never know of a radiator cooling fan to come on when engine cold ) You can figure out the rest. When the radiator fan stops working, the coolant does not cool down. Doc Motor Works Auto Repair is located in Shorewood, Illinois – just West of Joliet IL and I-55. No, only comes on when the coolant is too hot. It … A common problem vehicles experience is a cooling fan that doesn't kick on and off when it's supposed to. I have a 2000 Boxster S, and after completing the heater box foam repair and properly purging cooling system I noticed that my radiator fans did not come on when operating temp was reached, but they do work when AC is in operation. The grille cannot draw enough air through most of the time, which is why you have a radiator fan. If you don’t hear your fan turning on, don’t assume that’s the case, however, and rush out to the auto parts store to buy a new one. We serve customers in Plainfield, IL, as well as Shorewood. Several symptoms may point to a bad or failing thermo coolant fan switch. Insufficient Coolant. Unplug the electrical connector for the cooling fan motor located on the bottom of the fan motor. Try this one, fan runs on when engine is stopped. This field is for validation purposes and should be left unchanged. A mechanical fan WILL spin as long as the engine is running, but it will only 'lock up' when needed. The average cost for a radiator fan motor replacement is between $634 and $789. A temperature-sensitive switch functions to turn the fan on and off periodically. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. What are the names of Santa's 12 reindeers? Your engine temperature sensor is responsible for relaying your engine temp to the ECU. On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. When it's cool enough i just turn it off and roll the windows down for awhile. Answer. Question - Cooling fan running all the time. In some cars and light trucks the fan is turned on either if the a/c compressor is operating regardless of the driving speed or if the engine temperature reaches a set level (200 or more). On older vehicle models, just wait about 15 to 20 minutes for the engine to reach operating temperature. Many people blame the fan motor as the reason why the fan doesn’t run, but as we discussed above, it could be the thermometer or fan switch. This time turn on the ignition for a little longer and then t urn it off. 3. To get your cooling fan relay replaced, you will pay, on average, $80-$160, depending on the type of car you have and the mechanic's fees. The cooling unit seems to have 3 relays in it, feeding the fan motor via a resistor pack, presumably to give 3 different speeds. My cooling fan starts immediately when I start the car even though it is cold and stays on until the engine is shut off. Can a bad thermostat cause radiator fan not to work? To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. 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). The engine temperature should trigger the fan to turn on. If there’s an issue with the relay, the fan will be affected. It is not constant on, it runs at high speed (full blast) for about 3 seconds and then off. What are the symptoms of a faulty cooling fan switch? This is because the engine needs air to keep it at the optimal temperature. What is the aurora borealis called in the Southern Hemisphere? If you now turn ignition off immediately, you will now see that the fan will come back on again. Turn ignition back on, do not start the engine. Torque app was showing 98c and the fans didn't come on. Hey All, Can someone answer for me: [2002 Focus SE wagon, 2.0 Zetec] I'm having an engine overheating issue, and cooling fans are not turning on (I think). If the car is hot enough, they may be barely keeping up with demand and stay on. This time the fan … This is linked to a thermostat and works much like your home’s HVAC system. The fan turning on is normal and a consequence of the hot coolant, not a cause. Also know, are radiator fans supposed to run all the time? The length of time cycling on and off seems to correlate to the temperature. Any clues for determining fault would be appreciated. And I turned the ignition back on to see if the fan powered up. A cooling fan relay is used on vehicles that have an electrical fan to cool the engine. What temperature should the radiator fan come on? We use cookies to improve your experience. I've never seen it come on when the a/c is off but that doesn't mean it doesn't. Click to see full answer. Also I put my hand on the hose that leads up to the thermostat housing and that was cool. It is what sends the signal for the fan. On vehicles with air conditioning, rising refrigerant pressures will also activate the cooling fans. Neighboring communities include; Plainfield, Romeoville, Lockport, Channahon, Minooka, Plattville, Rockdale, Crest Hill, Millsdale, Fairmont, Preston Heights and surrounding Joliet communities of Troy Township and Will County, Illinois. It hadn't. If this is your first visit, be sure to check out the FAQ by clicking the link above. Even when engine cold. The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? The radiator fan makes a noticeable sound when it operates. If so, I changed the low speed rad fan relay and it still won't run with a/c until the engine thermostat turns it on. This will require a wiring diagram. Also, most cars will run the fans at a high speed if the A/C is turned on. Both radiator fans should always run when the AC compressor is engaged. Once the temp gets so hot, the ECU commands the radiator fan to come on. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. The labor should cost around $70, while parts should run you $10-$50. Asked by day2 in Elkton, MD on . cooling fans The answer to your question is yes both fans will run when your at 230 degrees, if you have the parking lights on and your at 212 degrees one fan will come on, and when you have the air conditioning on you have one fan on as well. Most fans should come on when the coolant reaches about 200 to 230 degrees. Our family owned car and truck repair service shop is on Rt-59 (north of I-80 and Rt-52) between Walmart and Target. The reason why this spells serious trouble is the radiator fan keeps your engine cool. Your vehicle's cooling system is crucial to its performance, and every time your engine overheats, you cause damage. As andyl says, Fuse F35 provides power to the Engine Cooling Unit & Fan. The first is the fan relay, which due to age or corrosion will stop switching the fan on and off. This comprehensive cooling system prevents the engine damage associated with overheating, and as an aside, the fan itself can also fail. Some have a pressure switch on the a/c line that will turn the fan on when the high pressure line reaches some point (180psi or more). Simple aftermarket fix, about £20 for all … No Whirring Noise from the Engine Bay. Labor costs are estimated between $102 and $130 while parts are priced between $532 and $659. The cooling fan relay essentially functions as the switch for the engine's cooling fans, and is therefore an important electrical component of the vehicle's cooling system. By continuing to use this site you consent to the use of cookies as described in … If you can’t and it doesn’t turn on eventually, Doc Motor Works can repair or replace it to keep your engine’s cooling system operating at peak efficiency. This article pertains to all vehicles. You may have heard of a part called the radiator fan switch or temperature fan switch. Required fields are marked *. What is internal and external criticism of historical sources? Yes, the radiator and coolant inside of it also prevent the engine from overheating, but the fan, too, plays a crucial role. Use the volt meter to test if there is power to the wires. Also when putting the air con on, it kicks in the fan and goes off when air con is turn off so that seems to be working fine also. - Chevrolet 2008 Hhr question Any time the coolant temperature rises to higher than normal levels, the fan will start and continue to run until coolant temperature returns to a normal range. The fan’s job is to keep the radiator fluid/water mixture cool while you drive. So, The fan runs mostly at idle or low speed when the engine is at normal temperature. To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. 1 reply Report. If the a/c button is on than the chances are the fan will be on as well, even if a/c is off the fan should still come on only when it needs. Your radiator fan should kick in at about 200 degrees Fahrenheit. If, for example, you’re stuck in traffic, you will not have enough air circulating over the radiator to cool the fluid and engine. Temperature will often determine the time that a radiator fan starts up. 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. Observe the cooling fans. Rising Temperature Gauge. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. Faster fans move more air, but slower fans are much quieter. Your email address will not be published. Herein, how do I know if my radiator fan is bad? cooling fan does not come on 2008 HHR 1800 miles temp is running around 198. have not heard or seen the fan come on. You need to get the temp up to about 116 degrees to see if the high speed fan to kicks in. How much does it cost to fix a radiator fan? If the relay shorts internally, it may cause power to be permanently switched on, … Call Doc Motor Works at 815-577-3893. Estimate does not include taxes and fees. If it does kick in then your low speed fan resistor has failed. The fan turns on to circulate additional air. Can you serve someone by email in California? Cooling fans stay on at all times. The fan deffo wasn't on when I turned the engine off. With a compatible motherboard or a fan controller, though, you should be able to adjust your fans’ speed for the perfect balance, so this won’t matter as much. 2005 Chrysler PT Cruiser. Should either of these parts fail – the thermostat or the switch – your radiator fan will not turn on or off and this spells serious trouble. Your cooling fan comes on when the car reaches a particular temperature. The second is the fan switch itself, the sensor which tells the relay when to activate the fan. Your email address will not be published. The cooling fan should come on immediately or within the next couple of minutes. The coolant may not be moving due to a water pump problem, blockage in the radiator or hoses, or a stuck valve, i.e., the “thermostat” in the coolant line. - G3. Normal voltage for a radiator fan is around 12 volts. Engine Cooling Fan The fan will then cycle on and off as needed to maintain the proper coolant temperature. You may have noticed your vehicle’s grille has holes or slats in it that open directly into the engine. Should it have got warm? Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit. It will also turn the fan off once the engine has cooled to under 200 degrees. The answer by Jason was: Part number 91064028 has options for fan turn on and off and with the 170 degree thermostat the hot coolant will enter the radiator at 170 and in many cases may cool the engine to this temperature without the fan running. The trigger is the thermostat in the radiator of your vehicle. This ensures the vehicle receives the proper diagnosis and repairs. How to Check a Radiator Fan Determine whether your radiator fan is manual or electric. If your fan isn’t running, or it doesn’t turn on until it’s too late, it’s best to have the radiator system inspected. Fan will now turn off. If the fans do not come on and the engine overheats turn off the engine. Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F. It can be normal for the cooling fans to run constantly under certain conditions. Some fans and cases even come with manual switches for basic fan … When adjusting your fan speeds you must make sure that, at …

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