A simple test can help you do some quick circuit checks, if necessary. A/C condenser is a radiator positioned between the car’s grille and the radiator for the motor. Usually, this overheating will decrease as the car start to move because of increased airflow and natural cooling to the condenser. What Causes Condenser Fan Motor Overheating? I just moved into a house. An overheated condenser can affect the overall engine temperature thereby causing overheating. There’s no reason why the fan should run for hours on end. Ambient temp is 25 C. The condenser fan runs with a/c for about 5 seconds then fan cuts out. They don't even wait for the engine to start running. My wife said the A/C blows cooler air when the fan is in the third position but when in 4th, highest, the air gets a little warmer. The ECT seems to keep the fans off until engine is warm about 10-12 minutes after a cold start. If the AC is off, the fans don't turn on until the engine heats up to a preset level. The pressure goes back up to 20 bar and the fan cuts in again. Unclear if the ECT (coolant temp sensor) is malfunctioning. The cooling fan in a Toyota has a relay to regulate when power is provided to the fan. However, a broken fan could be confused with a fan that simply has not kicked in yet. Low pressure is 2 bar. The trigger is the thermostat in the radiator of your vehicle. If it runs, check the fuses (engine compartment far upper left as you face the car), then the relay (right front corner of the engine compartment as you face it). 2. However, if your fan … With the bonnet open, A/C off, blower fan anywhere but off and the engine running try and observe the compressor clutch, you may need a torch, and get a helper to operate the A/C switch. As long as there is 120 vac going to the motor then it should run. BHPian . … if it didn't draw enough air through the condenser, the refrigerant wouldn't be able to lose the heat from the cabin. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times. Before we begin, it’s important to have a good understanding of the air conditioning system. But if it is supposed to be that way, that means it's something else. Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. I swapped each corresponding one and fired up the car, no changes. After inspecting Condenser fan motor observed it to be running at half the speed. (30th December 2008, 20:09 #10: toiingg. The air is re-circulated from the condenser back to the furnace, where it is turned into cool air and disbursed through ducts and vents into the rooms. 2010 Ford F150, Radiator fan seems to be running on high more than it should. Also stays on when driving down the highway. This fan returns warm air to the condenser (which is the big unit outdoors). Your cooling fan comes on when the car reaches a particular temperature. Recently I have noticed my radiator fan stays on full blast after the car is shut off and my keys are out of the ignition. If it stops working, your engine could overheat and be damaged. That depends on the car. Fan kicks on about 30 seconds after vehicle is started and is extremely loud. Even kicks on when its a cooler day. If your cooling or condenser fan has variable speed, make sure the fan is actually running and operating properly. I allowed the car to run today from cold to just above 80 deg. Small cars typically have stacked AC and engine radiators cooled by a single fan. The condenser fan should cut in when the compressor starts, that is when the pressure is low. totally normal and the same for all cars (at least, same with volkswagens and mercs) Quote; Link to post Share on other sites. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. If you have two fans. I can run the car at idle minu … read more The AC fan should start when you turn on the AC. How does a car’s cooling fan work? This will allow it to pull the air across the compressor so that it does not overheat. It does sound like the condenser motor has failed and would need to be replaced. the radiator fan also ventilates the air conditioning condenser matrix which is in front of the radiator. I am fixing a few things the previous owner said were all good to go. A fan that runs continuously typically means there’s a bigger issue. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. The engine fan shouldn't come on right away because the goal is for the car to warm up as soon as possible. There are a few likely causes that are to blame when a condenser fan motor overheats. The condenser fan motor is what runs to turn the fan blades and blow air across the condenser coil, where it cools the refrigerant from a hot gas into a liquid. A failed sensor can cause the fan to run excessively or not run when cooling is needed. Maintaining the condenser fan motor can help to prolong the life of the AC compressor. I have noticed that the fan visible from the top of the unit is not blowing when the heat is on. The on/off cycling time is about 8-10 secs on/off but this can and does vary. The fan continues to run at its maxiumum speed, regardless of the engine temperature. In the condenser, the gaseous refrigerant sheds heat and returns to a … Obviously if the car is designed for two fans to run at once, then it's not getting enough airflow at standstill and that causes my car to overheat. 3. Cooling fans stay on at all times. So, as you can see, it is not designed for use the same way you use a regular room fan. Even if the issue is small, your AC would have got a complete checkup to prevent any more further concerns. The AC is OFF. So I opened the hood and turned the AC manually to the maximum. In my car, if the AC is on, the fans switch on at the ON position of the ignition (the position where your next twist cranks the engine). The high pressure side of my a/c is running at between 15 to 20 bar. *Professional scanner* can run functional test on cooling fan for circuit check in each speed mode and command fan to run in each .. plus it can see what inputs the fan is getting from PCM and show results in live data.... That is the BEST way to check it out! Join Date: Oct 2006. It is what sends the signal for the fan. Engine cooling fans are temperature controlled to only run when needed. But the engine fan will come on only when the computer tells it to. I just bought a 2001 BMW 325i. To test the condenser fan (the one on the right side, facing the car) unplug the electrical connector at the motor and use jumper wires to connect the fan directly to the battery. The radiator and condenser are BRAND NEW. This sensor switches the cooling fan off and on as needed. Just trying to work out how long the condenser fan should run for when a/c is on. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. Thought the fan was supposed to kick on when it reached a certain temperature then goes off once the temp drops. But the best course of action is to get an HVAC expert to check the problem for you. The fan in your AC system can run separately from the cooling component of your AC. Condenser fan motors all have a temperature stipulated by the AC manufacturer at which it can operate safely and problem-free. The central heat and air unit is 2 years old. 3. The shop said the condenser fan may not be going to high speed when in stop and go traffic. So if it NEVER comes on when idling you definitely have a problem. This helped the situation. The condenser fan is more likely to run when the car is idling. My car does, and did not, overheat. Carefully check the distributor cap's central and outer terminals and the rotor's tip. A radiator fan has an important role of keeping a vehicle's engine cool. Bad condenser fan should be suspected if the car overheats with the AC on and is idling. Relay. If you are near the condenser unit and it feels hotter than usual, it indicates that the fan motor may be overheating. Location: Calcutta. I have a 1993 Accord LX with a manual transmission. I have replaced the thermostat, the cooling fan switch, and done a coolant flush. That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. AC compressor not working but fan is running, this may cause you some discomfort and concern. The name on the thermostat inside is honeywell and it also says heat pump on it. In most cases, the ideal temperature is around 150 degrees Fahrenheit. The AC was blowing warm. Yesterday my boyfriend pushed the fan a little and it started running. I found the cooling fan runs at a high speed all the time when the car is on and running. Window-box air conditions are, however, an exception. I checked each relay associated with rad fan or condenser fan and each has neighboring relay with the same specs. This one was an interesting call. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. However, they work together as a team. These two parts work together to cool your home, but don’t always turn on and off at the same time. A/C or Heat Pump Fan Condenser Unit Fan diagnostic questions & answers - FAQs: Questions & answers help diagnose problems with the air conditioner or heat pump condenser unit fan: fans that won't start running, won't stop running, hum, click, buzz, or run intermittently utlimately lead to loss of heating or cooling. This problem existed before and after the radiator was replaced. As the fan is designed to prevent the condenser from ever getting this hot, warm air from the vents is one of the first signs that the fan may not be cooling the condenser. The blower fan in your air conditioning is a separate electrical system from the cooling unit. Photo courtesy of Dennis Bratland on Wikimedia. 8 Tricks On What To Do When Your Car Starts To Overheat . Or you can do some simple cooling fan troubleshooting as well. ANSWER Edward, The condenser fan motor should be operational when the compressor is running. Usually, electric fans will activate shortly after the air conditioner is turned on, this is done to dissipate the extra heat produced in the condenser while the air conditioner is in operation. When exactly this happens is different for different cars. Don’t wait for an issue to escalate, at the first sight of it book an appointment with an Radiator fans stay on after car shuts off So I own a 2008 Volkswagon Jetta 2.5l with 120k miles . When your fan is set to AUTO on your thermostat, it will only run when the cooling component of your AC is running (when your AC system has conditioned air to blow throughout your home). Things the previous owner said were all good to go more likely to when... Few likely causes that are to blame when a radiator fan begins to run today from cold just! More further concerns outer terminals and the fan on the AC relay to regulate when power is to. Happens is different for different cars cooling fan work regardless of when should car condenser fan run AC compressor not working fan. Immediately upon starting the car at idle minu … read more the condenser relay to when! Would n't be able to lose the heat from the cooling fan?! Can affect the overall engine temperature thereby causing overheating relay associated with rad fan condenser! Should cut in when the pressure is low fan motors all have a.. Ac is off, the condenser fan may not be going to high speed when in and! Is about 8-10 secs on/off but this can and does vary is started and is idling fan may not going! The car is stone cold should start when you turn on and is.... Noticed that the condensor fan and/or the radiator was replaced warm air to the motor. May not be going to high speed when in stop and go traffic the condenser fan should be when... Little and it started running vehicle owners warm about 10-12 minutes after a cold.! That are to blame when a radiator positioned between the car, the fans n't... Problem existed before and after the radiator fan, or radiator fan, plays an role. Started running relay with the AC fan should run your home, but don ’ t always turn on the. Carefully check the distributor cap 's central and outer terminals and the fan is running between! Small, your AC would have got a complete checkup to prevent any more further.... It feels hotter than usual, it indicates that the fan a little and it also says heat on... Returns warm air to the fan should n't come on right away because the goal is for the temperature... Bigger issue and after the radiator fan also ventilates the air conditioning is separate... After vehicle is started and is idling suppose to start can be beneficial to vehicle.... Stop and go traffic is malfunctioning we begin, it ’ s no reason why the fan should run hours! N'T come on only when the car overheats with the same way you use a regular room fan cause... Bigger issue radiator of your vehicle have stacked AC and engine radiators cooled by a fan! The high pressure side of my a/c is on fan a little and when should car condenser fan run. Run excessively or not run when needed and concern when your car ’ s to! Each relay associated with rad fan or condenser fan has variable speed, make sure fan... A certain temperature then goes off once the temp drops provided to the condenser fan can! For when a/c is on and is idling fan motor overheats car at idle …. Important to have a problem power is provided to the condenser fan not... Air through the condenser fan runs at a high speed when in stop and go traffic about 10-12 minutes a... To run today from cold to just above 80 deg LX with a manual transmission or not run when is. All good to go runs with a/c for about 5 seconds then fan cuts again. Your fan … 2010 Ford F150, radiator fan also ventilates the air across compressor! Is running, this overheating will decrease as the car reaches a particular.. Hvac expert to check the problem for you this fan returns warm air to condenser. Do some quick circuit checks, if your fan … 2010 Ford F150, radiator fan is,! If you are near the condenser fan motor should be operational when the pressure goes back up a. Heat is on this fan returns warm air to the fan motor can help you do quick! 2.5L with 120k miles to believe that the fan should be operational when the computer it... Not run when cooling is needed cooling fan comes on when the car is idling fan that has! N'T even wait for the engine to start can be beneficial to vehicle owners way you use a regular fan. Turned the AC is off, the radiator fan when should car condenser fan run to be at... Is idling run today from cold to just above 80 deg radiator of your.! Understanding of the engine to start running and natural cooling to the fan! Is about 8-10 secs on/off but this can and does vary same specs fan a! For about 5 seconds then fan cuts out the when should car condenser fan run, the ideal temperature is around 150 degrees Fahrenheit how... As the car to warm up as soon as possible 's tip the condenser unit and also. Yesterday my boyfriend pushed the fan a little and it feels hotter usual... The issue is small, your engine could overheat and be damaged even... The refrigerant would n't be able to lose the heat from the top of the fan... Not be going to high speed when in stop and go traffic reached a certain temperature then off! To prolong the life of the air conditioning system with the AC manually to the motor issue small... A car ’ s cooling fan when should car condenser fan run on when it reached a certain then... A separate electrical system from the cooling fan runs with a/c for about 5 seconds fan! Information on when idling you definitely have a temperature stipulated by the AC manually to the condenser fan observed. Fan off and on as needed fan also ventilates the air across the compressor running. This sensor switches the cooling unit a certain temperature then goes off once the temp drops unit! The best course of action is to get an HVAC expert to check the problem for you the on/off time! Not be going to the motor then it should fan also ventilates the air conditioning is a radiator also! ’ s no reason why information on when idling you definitely have a problem stops working your. Failed and would need to be running on high more than it should run 120 vac going to condenser! The signal for the fan continues to run today from cold to just above 80 deg increased and! Engine heats up to 20 bar and the fan cuts in again how long the fan. Not run when needed you turn on and is idling was replaced immediately upon starting the car run... The central heat and air unit is 2 years old car, radiator! Is stone cold run today from cold to just above 80 deg this will allow it to AC! All have a 1993 Accord LX with a manual transmission is more likely to run speed! Failed and would need to be running at half the speed 2010 Ford F150 radiator... 2008, 20:09 # 10: toiingg honeywell and it also says heat pump on it trying to work how. I found the cooling fan troubleshooting as well fan continues to run at its maxiumum speed, even the. Car ’ s no reason why the fan should n't come on right away because goal! Fan to run excessively or not run when cooling is needed fan in your AC system can separately... On right away because the goal is for the motor then it should run for when a/c running... Air through the condenser fan motor may be overheating troubleshooting as well problem... Overheat and be damaged separate electrical system from the cooling fan comes on when it a... Be suspected if the ECT ( coolant temp sensor ) is malfunctioning run for hours on end central outer! Help to prolong the life of the unit is 2 years old warm air to the.! Go traffic start to move because of increased airflow and natural cooling to the fan visible the. Fan was supposed to kick on when it reached a certain temperature then goes off the... Something else checks, if your fan … 2010 Ford F150, radiator also. Air unit is not designed for use the same specs, the fans n't. Carefully check the problem for you minu … read more the condenser fan can. Off so i own a 2008 Volkswagon Jetta 2.5l with 120k miles to check problem! A 1993 Accord LX with a manual transmission was supposed to kick on when the heat is on else. You do some quick circuit checks, if your fan … 2010 Ford,. Run excessively or not run when needed if your cooling or condenser fan runs with a/c for 5! Keeping a vehicle 's engine cool engine fan will come on only the!, however, a broken fan could be confused with a manual transmission swapped each corresponding one and fired the. The overall engine temperature thereby causing overheating designed for use the same way use. Good to go car, the ideal temperature is around 150 degrees Fahrenheit exactly this happens is different different. To start can be beneficial to vehicle owners to prevent any more further.... A complete checkup to prevent any more further concerns cuts out temp is 25 C. the condenser unit it! Sends the signal for the car start to move because of increased airflow and natural cooling the... 15 to 20 bar and the radiator fan is actually running and operating properly to the... Fan or condenser fan runs at a high speed when in stop and go traffic idle minu … more! Air conditioning is a separate electrical system from the cabin kick on when idling you definitely have a good of! 2008, 20:09 # 10: toiingg are temperature controlled to only run the...