That software can control BOTH types of hardware RGB systems, depending on which type of header is included on the Gigabyte mobo. The trigger is the thermostat in the radiator of your vehicle. Why does the radiator fan on my Kawasaki Mule 3010 only work inadvertantly? Multiple relays and resistor packs may be used to control fan activation. I got under the car again and found that the PS fan is indeed totally seized. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. The only other thing I can think of is a wiring or computer problem. Whenever I drive it on the highway for one hour or more, the temperature meter gets to half guage. So i got a new radiator and installed that. 960 Posts . 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. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. 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. Aug 12, 2011 #13. Answer Save. my radiator fan works perfectly but ONLY if i have the AC turned on. Viewed 5k times 3. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. The inhibitor is a chemical which stops corrosion by preventing the water from reacting with the metal of your radiators. The temp light comes on and if the fan kicks on, everything is fine. You may also find the same control valve at heating convectors (but not usually at heating baseboards). The radiator fan does a very important job; it cools the radiator to stop the car from overheating. Thus, my car will overheat in city traffic (but not on highway). My car is an 05 5.7, here is my problem. One post advised that if the power steering fan seized (which was quite common), the fuse would blow, rendering the radiator fan useless too. How does a car’s cooling fan work? thebesthonda. If the fan does not turn on, you will need to replace it. Step by step instruction on how an automotive radiator cooling fan works. 57 Posts . Why does my fan come on when I start my car? 29,095 satisfied customers. 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. Long story short, I've since replaced the thermostat and the radiator fan switch (located in the thermostat housing). I realized that the radiator and condenser cooling fans were not coming on when needed (after a half hour of the engine running) so I pulled the relay switch and used a paper clip to "jump" it and the fans came on. Okay so i replaced my radiator and now my fans dont turn on. I have replaced thermostat. The thermocouple relay may be bad, of the temp sensor is bad. @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. High School or GED. As soon as I approach a traffic stop light, trying to press … read more. It is a 2001 . Symptom 3: A single radiator is cold/not working . Your fans work through a thermocouple relay. Subaru and Nissan factory training. Just because the radiator fan is not on does not mean that it is not working. I have checked the relay and it is good. 2 Answers. Discussion Starter • #1 • May 15, 2010 (Edited) Hi everyone. The fans needed to be replaced and fell apart as soon as I removed them from the engine. Fans work, both heater and radiator. 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