The relays are arranged in a series/parallel configuration that allows the PCM to operate both fans together at low or high speeds. Engine Cooling Fans not working... Help! Next, I checked the relays, both tested operational. Otherwise, the switch is not working. You need to inspect all the wiring leading into and out from the radiator fan. Check power and ground at the fan connector. If it doesn't spin, a code should have been recorded. Your engine cooling fan will not work if you have a blown fuse. Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. Rover 200 & 400 Owners Club Members Section [full members only - ask a mod for access]. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay. • After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. It is the usual wear and tear over the years that may cause the springs in the clutch to corrode or even burn out. Look for the check engine light. Usually a bad or failing cooling fan motor will display a few symptoms that can alert the driver of a potential problem that should be serviced. It could be low on refrigerant or a bad relay, a sensor, an ambient temperature switch or the AC pressure transducer is bad. if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN … Out in the desert with 2 old Jeeps and a Saab 9-3 cabrio. The easiest way to check it is; visually check it for a … When I got it back I noticed the cooling fan was not coming on. Honda Fans not working? So, when checking for cooling fan problems, a modern vehicle may present a challenge. Since you omitted the model, year and engine size we cannot assist you with specific details on where these parts are etc. One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you find a blown fuse or tripped breaker, the fan motor might be pulling too much voltage. I swapped all 3 relays with the same relays in my 2005 Lesabre. Had the AC system checked. Now back probe the other wire at the connector. If you do have low coolant, don’t fill it up until the engine has cooled off. The electric cooling fan uses a direct current (DC) electric motor with a thermo switch; module or computer control to turn it on or off. cooling fan not working :( S Type 2002 3.0 V6. In general; most vehicles on the road have two types of fuses. sensor...still not working. Engine cooling fan not working. Discussion Starter • #1 • 7 mo ago. Start and idle the engine, and back probe the connector terminals with the test light. So, this kind of […], Not operating within a “normal” temperature range of about 195 to 220 degrees F. will cause automotive engine overheating. The ground path is provided at G101. Like any other clutch, a fan clutch will wear out over time. If your engine is overheating, or shows signs of running hotter than normal; you may have a problem with your electric cooling fan. So, one quick way to check the fan is to start the engine and turn on the A/C to max. Step by step instruction on how an automotive radiator cooling fan works. We use cookies to give you the best possible experience on our website. When I pull the connector off the temp sensor the fans go on so I know the fans and fuses are fine. If the wires between the positive and negative … I replaced the engine cooling fan motor..still not working I replaced the coolant temp. by r8gti » Sun Jul 19, 2015 10:27 am, #2 Cooling Fan Not Working #1 Post by r8gti » Sun Jul 19, 2015 … My cooling fan is not working properly while AC running and AC is not cool. We do not intend to infringe any legitimate intellectual right, artistic rights or copyright. The fan has a final stage resistor built in so it gets a pwm signal for activation and speed. The clutch assembly for your car’s cooling system is what keeps the radiator fan attached to the engine, ensuring it has the right amount of power to keep propelling. If this clutch goes broke, the fan won’t work. They do not start when the engine is warm... this is the problem. r8gti Posts: 7 Joined: Wed May 27, 2015 2:54 pm. 1. by r8gti » Sat Jul 25, 2015 12:08 pm, #9 Messages 86 Likes 24 Location chapmansboro. The one fan turned...the one that wasn't working still wouldn't work. Engine cooling fan not working. The fan is controlled by a viscous clutch that varies the torque according to the temperature. Re: 99 seville.. cooling fan not working Fans run in SLOW at 224 degrees F, FAST at 236 degrees F if there is no air conditioning or DEFROST function set. If you do have low coolant, don’t fill it up until the engine has cooled off. Probably be a good idea to shut off the engine first. Did any cooling fan come ON? It is possible that a wire has worn out due to heat and needs replacement. (ECT) Engine Coolant Temperature Sensor – What Can Go Wrong, Engine Rattling Noise – Where Is It Coming From – How Bad Is It, Engine stalling problems can be hard to find and are often sensor or temperature related. on my vehicle - ML 55 - the cooling fan controller and fan are integrated. Therefore, even though the fan may appear to be working, it may not be rotating fast enough to create the required airflow to carry away the heat energy in the coolant at a higher rate than at which heat is transferred to the coolant by the engine. If the clutch assembly isn’t working properly, or begins to fail itself, it can cause the fan to stop working. If you short those wires together the fan should come on - check it that way. Put new fan clutch on and still doing same thing. If you can’t find a suitable relay, you still can test the relay. Post by 4V8s » Fri Jul 24, 2015 9:12 pm, #8 However, the fans do work when I turn AC on. Electric cooling fans are used, to move air through the radiator, when the vehicle is not in motion. Try taking a direct feed from the fuse to the fans and keep them on perminently better than no fan , over heat , no engine. Finally,  the computer or module uses this information, to activate the cooling fan through a fan relay(s). 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