If you are near the condenser unit and it feels hotter than usual, it indicates that the fan motor may be overheating. A failed sensor can cause the fan to run excessively or not run when cooling is needed. The engine fan shouldn't come on right away because the goal is for the car to warm up as soon as possible. BHPian . The condenser fan should cut in when the compressor starts, that is when the pressure is low. When exactly this happens is different for different cars. 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. Cooling fans stay on at all times. ANSWER Edward, The condenser fan motor should be operational when the compressor is running. 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. This one was an interesting call. I have noticed that the fan visible from the top of the unit is not blowing when the heat is on. The central heat and air unit is 2 years old. 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. I am fixing a few things the previous owner said were all good to go. if it didn't draw enough air through the condenser, the refrigerant wouldn't be able to lose the heat from the cabin. It does sound like the condenser motor has failed and would need to be replaced. But the engine fan will come on only when the computer tells it to. Condenser fan motors all have a temperature stipulated by the AC manufacturer at which it can operate safely and problem-free. Or you can do some simple cooling fan troubleshooting as well. Also stays on when driving down the highway. A/C condenser is a radiator positioned between the car’s grille and the radiator for the motor. Small cars typically have stacked AC and engine radiators cooled by a single fan. 2. The pressure goes back up to 20 bar and the fan cuts in again. The fan in your AC system can run separately from the cooling component of your AC. In the condenser, the gaseous refrigerant sheds heat and returns to a … (30th December 2008, 20:09 #10: toiingg. Even if the issue is small, your AC would have got a complete checkup to prevent any more further concerns. Photo courtesy of Dennis Bratland on Wikimedia. … I have a 1993 Accord LX with a manual transmission. That depends on the car. 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. 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. 8 Tricks On What To Do When Your Car Starts To Overheat . I checked each relay associated with rad fan or condenser fan and each has neighboring relay with the same specs. This sensor switches the cooling fan off and on as needed. An overheated condenser can affect the overall engine temperature thereby causing overheating. The trigger is the thermostat in the radiator of your vehicle. This problem existed before and after the radiator was replaced. 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. Low pressure is 2 bar. A radiator fan has an important role of keeping a vehicle's engine cool. Maintaining the condenser fan motor can help to prolong the life of the AC compressor. If it stops working, your engine could overheat and be damaged. The AC is OFF. This helped the situation. Carefully check the distributor cap's central and outer terminals and the rotor's tip. Fan kicks on about 30 seconds after vehicle is started and is extremely loud. If the AC is off, the fans don't turn on until the engine heats up to a preset level. Join Date: Oct 2006. Usually, this overheating will decrease as the car start to move because of increased airflow and natural cooling to the condenser. AC compressor not working but fan is running, this may cause you some discomfort and concern. I have replaced the thermostat, the cooling fan switch, and done a coolant flush. I allowed the car to run today from cold to just above 80 deg. However, if your fan … 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). 2010 Ford F150, Radiator fan seems to be running on high more than it should. Bad condenser fan should be suspected if the car overheats with the AC on and is idling. What Causes Condenser Fan Motor Overheating? 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. I found the cooling fan runs at a high speed all the time when the car is on and running. Relay. 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. My car does, and did not, overheat. But the best course of action is to get an HVAC expert to check the problem for you. If you have two fans. Even kicks on when its a cooler day. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times. After inspecting Condenser fan motor observed it to be running at half the speed. I just moved into a house. Window-box air conditions are, however, an exception. I just bought a 2001 BMW 325i. Yesterday my boyfriend pushed the fan a little and it started running. the radiator fan also ventilates the air conditioning condenser matrix which is in front of the radiator. However, they work together as a team. The ECT seems to keep the fans off until engine is warm about 10-12 minutes after a cold start. The AC fan should start when you turn on the AC. But if it is supposed to be that way, that means it's something else. *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! It is what sends the signal for the fan. A fan that runs continuously typically means there’s a bigger issue. This will allow it to pull the air across the compressor so that it does not overheat. Ambient temp is 25 C. The condenser fan runs with a/c for about 5 seconds then fan cuts out. So I opened the hood and turned the AC manually to the maximum. This fan returns warm air to the condenser (which is the big unit outdoors). Thought the fan was supposed to kick on when it reached a certain temperature then goes off once the temp drops. In most cases, the ideal temperature is around 150 degrees Fahrenheit. 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 fan continues to run at its maxiumum speed, regardless of the engine temperature. 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. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. 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). Don’t wait for an issue to escalate, at the first sight of it book an appointment with an They don't even wait for the engine to start running. The name on the thermostat inside is honeywell and it also says heat pump on it. That leads me to believe that the condensor fan and/or the radiator fan is not running to blow cool the refrigant. The shop said the condenser fan may not be going to high speed when in stop and go traffic. The on/off cycling time is about 8-10 secs on/off but this can and does vary. 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. How does a car’s cooling fan work? totally normal and the same for all cars (at least, same with volkswagens and mercs) Quote; Link to post Share on other sites. There are a few likely causes that are to blame when a condenser fan motor overheats. The condenser fan is more likely to run when the car is idling. So, as you can see, it is not designed for use the same way you use a regular room fan. Radiator fans stay on after car shuts off So I own a 2008 Volkswagon Jetta 2.5l with 120k miles . 3. Before we begin, it’s important to have a good understanding of the air conditioning system. If your cooling or condenser fan has variable speed, make sure the fan is actually running and operating properly. The AC was blowing warm. As long as there is 120 vac going to the motor then it should run. I can run the car at idle minu … read more A simple test can help you do some quick circuit checks, if necessary. The high pressure side of my a/c is running at between 15 to 20 bar. Unclear if the ECT (coolant temp sensor) is malfunctioning. Just trying to work out how long the condenser fan should run for when a/c is on. These two parts work together to cool your home, but don’t always turn on and off at the same time. The cooling fan in a Toyota has a relay to regulate when power is provided to the fan. 3. Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. Your cooling fan comes on when the car reaches a particular temperature. The blower fan in your air conditioning is a separate electrical system from the cooling unit. I swapped each corresponding one and fired up the car, no changes. So if it NEVER comes on when idling you definitely have a problem. Engine cooling fans are temperature controlled to only run when needed. This is one reason why information on when a radiator fan is suppose to start can be beneficial to vehicle owners. Location: Calcutta. 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