Other fan does not come on and it is a new fan. Service Center Owner / Technician. The temp light comes on and if the fan kicks on, everything is fine. This article pertains to all vehicles. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. If you have problems with the radiator fan, you need to take care of them immediately or you could cause serious damage to your car. The radiator fan does a very important job; it cools the radiator to stop the car from overheating. I checked the connection and that was fine, the fuses were also fine. The only other thing I can think of is a wiring or computer problem. If the radiator fan is in working condition, move on to the next step. 3,084 satisfied customers. Figure 3. How does a car’s cooling fan work? The fact that it is compatible with RGB Fusion does NOT make it work! I have a 1995 subaru legacy. Sometimes they alternate. Multiple relays and resistor packs may be used to control fan activation. When I disconnect the temperature sending unit the temperature gauge in the car does not work. thebesthonda. silentbravo wrote:Those square fuses are called J Case fuses, sold by Littelfuse. Why does the radiator fan on my Kawasaki Mule 3010 only work inadvertantly? It is the last line of defense between you and an overheating engine. Only one radiator fan running. my radiator fan works perfectly but ONLY if i have the AC turned on. One fan comes on at 227 degrees and goes off at 217 degrees. If the fan does not turn on, you will need to replace it. Nothing physical blocking it. 29,095 satisfied customers. Mike V. Subaru Technician. 8 years ago. The trigger is the thermostat in the radiator of your vehicle. It looks like I've got two main fan relays and a sub fan relay that I'll have to check. How Radiator Cooling Fans Work. Without it, the engine can reach dangerous temperatures and damage engine components. There should always be at least one fan on when A/C is on, except at highway speeds all fans may be disabled. Okay so i replaced my radiator and now my fans dont turn on. See Contact Test in Step 1. It is a 2001 . Anything else is likely to have an adverse effect – and that often manifests as banging, clanking or gurgling noises. Show more. My radiator fan is driving my crazy. So i got a new radiator and installed that. the radiator fan only one side kicks on. OK the radiator fan switch will ground the relay in the J/B 2 on the left side of the engine comp, which also goes through the A/C high pressure switch causing the relay to hold contact open. Does the radiator fan run? Unplug the radiator fan connector. Relevance. Run jumper wires between the connector's two electrical terminals. 555 1. Tested the fan with 12V when the fan was out of the car. If anyone has any advice or … A bad sensor will tell the car that everything is normal while the engine overheats. When is this fan supposed to come on: at what temperature and when? Subaru and Nissan factory training. Changed the cooling fan relay it worked so its not the fan motor. is the motor fan's broken? If the radiator valve does not turn in that direction, try turning it in the other direction (clockwise or "closed") to see if the radiator valve is stuck. My car is an 05 5.7, here is my problem. One fan will come on when the vehicle temp hits between 180+ to 210+. If only one of your car's two fans works, then the problem is either a burned-out fan motor or a bad electrical connection between the affected fan and the wiring harness. Symptom 3: A single radiator is cold/not working . Works great for a while then only sometimes. I changed the whole fan assembly and both relays, but still only one fan will come on. Why does my fan come on when I start my car? Your fans work through a thermocouple relay. They are designed to only run when needed. Discussion Starter • #1 • Mar 6, 2011. I have replaced the temperature sending unit. Both fuses are good. I tested it and it gets power when I just do it myself but it will turn on … read more. It is supposed to kick in around 105C or 106C I unplugged the radiator power connector and put a multimeter across the plug terminals and read no voltage even when the temp was at its highest. That software can control BOTH types of hardware RGB systems, depending on which type of header is included on the Gigabyte mobo. If the radiator fan is not working, it’s a serious problem. You may also find the same control valve at heating convectors (but not usually at heating baseboards). The sensor may be disconnected, lose, or corroded, or wire broke. The inhibitor is a chemical which stops corrosion by preventing the water from reacting with the metal of your radiators. Electric cooling fans for radiator run when AC is turned on. Seized Motor. Fan Selection: Depending on vehicle design, the fans may operate singly or in tandem. the other side will not turn on. the ac will not work. AG 305 Proven Member. @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. Did you check to make sure power is going from the hot wire to the fuse block for the fans? The temp increased to to 109C and the radiator fan didn't kick in. Does the one fan come on with the a/c? sorry to bring back a thread from the dead but im having the same exact issue. Yes, a broken radiator fan can cause the air conditiong to stop working. Refill the radiator, test it, and add some corrosion inhibitor to stop rust. Radiator fan testing points. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. 2 Answers. Answer Save. What else can I check? Viewed 5k times 3. The Cause: If just one of your radiators is not playing ball, it could be down to either a faulty or jammed valve, or alternatively a blocked pipe could be the culprit. If it stops working, your engine could overheat and be damaged. If I unhook the temperature sending unit both fans run continuously. Sometimes the fan does not kick on at all. The fact that the driver side hi speed fan does not come on when commanded to points to the relay that is called "fan contro relayl".This relay is pcm ground side controlled, together with the "cooling fan 1relay". Water pump seems to be working. Ask Question Asked 4 years, 3 months ago. 960 Posts . Both fans come on when the A/C is turned on. I have checked the relay and it is good. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Does anyone know if losing one of these relays would knock out both fans? Active 4 years, 3 months ago. My 1st stage was obviously out of action due to the resistor, but at some stage the PS fan had seized, blowing the fuse and disabling the 2nd stage fan. YES - Go to step 5. Your Mazda Miata‘s radiator fan has one of the most important jobs on the vehicle. Then you know it is your fan switch. On some vehicles, for example, only the condenser fan operates with the air conditioner, while only the radiator fan operates based on engine temperature. Jun 18 2018, 5:54pm. Discussion Starter • #1 • May 15, 2010 (Edited) Hi everyone. Lv 7. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. Joined Apr 20, 2008. Any suggestions? Larger parts stores may have them on the shelf. The thermocouple relay may be bad, of the temp sensor is bad. Now, it turns out that your case has the plain RGB type of RGB fans, based on the case website. You really need to have the fan replaced, or at least, have a diagnostic check to see what is causing the fan to stop working. I've checked the fuse in the footwell and it is fine. Just because the radiator fan is not on does not mean that it is not working. Only one of the dual fans works. 2005 Honda Accord: 2.4L..cyl..a coolant bleed screw..radiator. Candid Chris. Even when I turn on the AC, only one fan works. Surprise. But never are they both on at the same time. Today while adding coolant to my car, I noticed that once the car reached running temperature only the fan on the passenger side had turned on. High School or GED. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. It is what sends the signal for the fan. the radiator popped because it was old and after a couple weeks of the fan not doing its job i guess it just got too hot and cracked. 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