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