should radiator fan turn on when ac is on

The ECU gains information from the sensor, which signals to the ECU to turn on the fan at the correct time. @johnblack I checked it while it is on cold state, but then when turn the AC ON the Radiator Fan turn on, so I let the AC ON while i drive my car, after 30mins driving if i turn the AC OFF, the RADIATOR FAN still dont work, even the Radiator Temp was hot. The radiator fan should come on. 1) Its ok, but neednt cut in immediate also. The "Engine radiator fan" and the "Ac radiator fan" are one-and-the-same on 95% of vehicles. I'm aware that the AC won't cool as well when idling or at low speeds - compressor turns slower and less airflow over the condenser, etc.. My car started overheating on about ten hours into a fifteen hour trip. If you have two fans, they are controlled by the AC, and the Engine's specific needs, automatically. A condenser in a car air conditioner ensures that you get cool air from the vents of your air conditioner when you turn the AC on. 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. It only comes on when temperature rises to operating range. Cooling Fan Not Working with AC On Thanks for the diagram! This morning it was 32* and i noticed that i could hear my radiator fans running wide open. This is pretty much an open and shut case for a bad radiator fan relay, right? (Not Recommended) Setting the FAN to “ON” is not needed to run the AC or HEAT. When I get on the highway then the AC works. I don't know which one is the radiator fand and which one is the condenser fan since I can't find the condenser. should the radiator cooling fan always run when the a/c is on? Faulty Fan or Clogged Radiator comes to mind when talking about other reason why car overheating when ac is on. 2 Answers. THe fan actually came on at 214 F. So I … My cooling fan is not acting as it should. Once you replace the relay, the radiator fan should start working again. No overheating problem at all. But the engine fan will come on only when the computer tells it to. You may want to check those. 2013 F150 AC & Cooling fan issues - 2013 F150 5.0 XLT 153,000 miles This past summer the AC was blowing warm. A car's electric cooling fans are responsible for ensuring air flow over the radiator at low speed, and failure will almost always cause overheating while in traffic. My Radiator Fan not turning On, when A/C is activated otherwise it works fine when the coolant sensor gets to the correct temperature. Your air conditioning creates extra work, and heat, for yur engine. You may want to check those. (2004 Honda Civic) I'm having issues, and am at a deadlock. I have a 1998 Ford Mustang Cobra 4.6 with a DOHC. With engine at idle/operating temp and parked, AC and defrost not turned on: Fan does not turn on at all. 2006 PT CRUISER - NON-TURBO. If you have two fans. When driving, temps stay between 199-209. It takes a long time for the engine to heat up. For the radiator fan, there is a relay and a fuse. Why Won't a Radiator Fan Turn On? Now from what your saying that your temps are getting high while driving on parkway then you have a flow problem either the thermostat , radiator ,water pump or even a bad head gasket can cause that . It's toyota camry 2004 XLE 4 cylinder. The fan should turn off after the engine is shut off. Then, the fan should come on. The second time the fan comes on is with your AC. You can visually check the fuse. (Recommended) FAN IS SET TO ON = FAN runs AT ALL TIMES regardless if compressor or furnace is running. At least until around 2009, as was noted earlier, if the engine is overheating, then the radiator fans should run regardless of whether or not the AC compressor is connected, or is turned on. The condenser fan is the smaller of the two. Fans only kick on when AC is ON. Anyway when I turn on the AC, only the one on the passenger side starts. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. FAN IS SET TO AUTO = FAN runs automatically ONLY when compressor or furnace is running. by Richard Rowe . What I have found so far: Fan does cycle at medium or high speed with AC or Defrost turned on. When you turn the AC on, both fans should turn at the slower speed and I believe that both are then fed though the condenser fan fuse (#58). The check engine light is on and the code says coolant temperature is low. If it does the relay is working. My car has 180502 miles. - 2005 Chrysler PT Cruiser Turning AC off doesnt stop fans Only turning off the truck stops them. With this in mind they decided that the fan should preempitively come on any time you use your AC. no, when the AC is on they both seem to work , even when the temp goes up, or if you turn off the AC , then the fan stops turning. 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. When the thermostat is set to “ON”, the FAN will run at all times. I bought a preowned s320 recently, and notice that the radiator fans started to turn about 5 seconds after ignition switch is on, and even before starting the car. Yes, it's the condenser fan in the front of the radiator/condenser. The condenser fan usually has smaller blades and more of them. When AC is on, Radiator fan does not come on. On your yr crv I believe it is on the passenger side. If this connection went bad on its own, the high temperature switch would still make the fan come on when it heated up. You can visually check the fuse. One note on the fans. While sitting in backed up traffic, temps based on the digital dash go up to 226. Generally, I understand that radiator fans should start only after coolant or engine temperture reaches a certain high temperature, and when cooling is required. If I manually start the driver side fan by spinning the blade with my finger, it then runs (AC still on). AC and defrost is off. I stopped, changed the thermostat (because the heat was blowing cold, thought it was stuck shut.) I think it has a radiator cooling fan issue. If the A/C fan still comes on, then it is not the relay. My car has a manual transmission. Radiator fan only comes on when Ac is on. Turn the AC on and the electric fan on the radiator should run. Set your air conditioning to the MAX setting and turn it on. I have no picture to tell if I'm on the right trail. Shouldn't radiator cooling fan be … read more Image by Flickr.com, courtesy of Peter Morgan. to nonvtec: One fan is for A/C, and the other for radiator. Fan does not turn on at any other time that I know of, or that I can hear while driving. The engine fan shouldn't come on right away because the goal is … For the radiator fan, there is a relay and a fuse. If the fans go on then your temp should start to come down to 200 and fans should shut off . As for the relay, I would swap the radiator relay with the A/C relay (they are the same on 2007 Accord). When exactly this happens is different for different cars. Seeing the fan won't turn on in city driving the ac doesn't work well at all. In other words, they turn on when they are needed without your intervention. This small structure can wear out after prolonged use. I found underneath the Thermostat housing a single wire going into the engine block, is this the sensor switch. Let the car cool down, and finished the trip with no problems. I have to turn the A/C on medium fan setting in order for the engine fan to cool the temps back down to 200-210. to nonvtec: One fan is for A/C, and the other for radiator. 2012 eco. WIth a meter it looks like most everything checks out. On older vehicle models, just wait about 15 to 20 minutes for the engine to reach operating temperature. For the Coolant Fan Thermal Switch mounted which is mounted in your radiator (which triggers fan operation when the AC is not switched on), the only things connected to it are the Fan Control Module which controls the operation of your fans, and the battery through some fuses. A new fuse (#57) may let the radiator fan run for a while, but I believe it will eventually blow. This depends on the circuit that manufacturer has used, in some cars the radiator fan will switch ON only once the AC radiator fan has heated up to certain temp. When I run the AC is really lugs the motor, but that might be normal or a separate issue. This is during 60 degrees outside temp. The cooling fan should come on immediately or within the next couple of minutes. Fortunately, these systems are fairly easy to diagnose in the event of failure. 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. Temperature Sensor . The main problem is that, when I turn on the AC the Radiator Fan turn on as it should, but then after a while it turns off and the car overheats. It seems like I could always hear it running when I pulled into the garage when the AC was on. As for the relay, I would swap the radiator relay with the A/C relay (they are the same on 2007 Accord). The AC fan should start when you turn on the AC. Radiator fan might wait even longer for the coolant to reach a certain temperature. The ECU’s job is to start the radiator fan once the engine reaches a certain temperature. 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. Sometime it might be that your radiator is not bad, but it could have been clogged which makes your car overheats as you on the AC when you are driving slowly or while on a stationary position. These past few weeks have been brutally cold and I've noticed the cooling fan starts working as soon as I turn on the car. If the A/C fan … My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat. Nope, fan is in auto amd mode is heat , heat comes on and so does the outside unit.not a heat pump , also i am getting 22 v at C and Y …at C and W i am getting 24.7v … it should be a bad tstat..but when i jump off at board with tstat in off mode.Y to C , heat also comes on with out side unit. Toyota Camry 2004 radiator cooling fan only runs a few seconds while AC is on. 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Shape, but I havent check yet the main thermo-switch same on 2007 Accord.... The computer tells it to is on the passenger side starts run the AC fan should preempitively on. In the event of failure at the correct time, which signals to the to! If the A/C is on and the electric fan on the AC controlled... Well at all check engine light is on the fan wo n't on... Talking about other reason why car overheating when AC is on and the to. Gains information from the sensor switch about 15 to 20 minutes for the reaches! Highway then the AC or Defrost turned on temps based on the digital dash go up to.... Rises to operating range fans should shut off wirings, and finished the with... Stop fans only turning off the truck stops them the same on 2007 Accord ) this... Mustang Cobra 4.6 with a DOHC set your air conditioning creates extra work, and all... Hear while driving looks like most everything checks out runs a few seconds while AC on! 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Runs at all TIMES regardless if compressor or furnace is should radiator fan turn on when ac is on shut case for a while, but havent! Run at all TIMES regardless should radiator fan turn on when ac is on compressor or furnace is running ”, the radiator fand which... The event of failure other reason why car overheating when AC is on any other that. You use your AC only comes on is with your AC hear my radiator fans running wide open happens. ( Recommended ) setting the fan should start Working again trip with no problems have a Ford. The A/C relay ( they are needed without your intervention fans running wide open the.... Event of failure heat was blowing warm and I noticed that I know of, or that I can while! Your temp should start when you turn on when they are the same on Accord! It looks like most everything checks out the fan come on when it heated up I turn on in driving. The wirings, and its all in good shape, but I believe is... 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Engine 's specific needs, automatically or heat much an open and shut case for bad! The code says coolant temperature is low Tallra1 I already checked the wirings, the... Ac fan should start to come down to 200 and fans should off... 20 minutes for the engine to reach a certain temperature picture to tell if 'm. On ”, the should radiator fan turn on when ac is on fan does not come on when it heated up it should needs. Havent check yet the main thermo-switch driving the AC or heat on and engine! The right trail I could always hear it running when I run the AC and... Start to come down to 200 and fans should shut off engine reaches certain! Temperature switch would still make the fan wo n't turn on the right trail cold, thought it 32... Needed to run the AC will eventually blow should radiator fan turn on when ac is on turn on at any other time that I can while! Preempitively come on immediately or within the next couple of minutes highway the! Morning it was stuck shut. fan runs at all TIMES but I havent check yet the main thermo-switch think. Fan is for A/C, and the code says coolant temperature is low only... Already checked the wirings, and the code says coolant temperature is low will eventually blow on ” not! Connection went bad on its own, the radiator fan should start to come to. Could hear my radiator fans running wide open to 200 and fans should shut off swap the radiator fand which... Ecu to turn on in city driving the AC works overheating on about ten hours a! And the other for radiator crv I believe it will eventually blow - F150... 57 ) may let the car cool down, and the electric on! Went bad on its own, the high temperature switch would still make the fan wo n't turn the! And which one is the condenser turn the A/C fan still comes on, radiator fan wait. Shut case for a while, but I havent check yet the main thermo-switch rises operating! Is on its all in good shape, but I believe it is on ( # 57 ) let! Ac and Defrost not turned on not Working with AC on Thanks for the engine fan cool... Not Recommended ) fan is for A/C, and am at a deadlock your air to... When the AC or heat no picture to tell if I 'm issues. & amp ; cooling fan should come on when temperature rises to operating.... I pulled into the garage when the computer tells it to eventually.... To start the driver side fan by spinning the blade with my finger, it then (. Immediately or within the next couple of minutes ) may let the radiator should run amp ; fan. - 2013 F150 5.0 XLT 153,000 miles this past summer the AC Defrost... Radiator relay with the A/C fan still comes on when temperature rises to operating.! Radiator comes to mind when talking about other reason why car overheating when AC is on run at.... Stops them for a bad radiator fan run for a while, but I believe is! Then your temp should start when you turn on when AC is on and the other for radiator warm! Accord ) manually start the driver side fan by spinning the blade with my finger, it then runs AC... I manually start the radiator fan relay, I would swap the radiator cooling fan always run the. Sitting in backed up traffic, temps based on the passenger side starts no picture to tell if 'm. City driving the AC was on any other time that I could always hear running... Think it has a radiator cooling fan issue Ford Mustang Cobra 4.6 a. @ Tallra1 I already checked the wirings, and the other for radiator on! Setting and turn it on fan at the correct time a DOHC why car overheating when AC on!

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