No overheating problem at all. Fan does not turn on at any other time that I know of, or that I can hear while driving. If you have two fans, they are controlled by the AC, and the Engine's specific needs, automatically. The "Engine radiator fan" and the "Ac radiator fan" are one-and-the-same on 95% of vehicles. Then of course relay 2 & 3 in the relay box work the radiator fan & the condenser fan. With engine at idle/operating temp and parked, AC and defrost not turned on: Fan does not turn on at all. i was wondering if u can help me wire the Ac and the cooling fan to operate on high when they active. its 108 plus here in texas and the factory low setting is not cutting it. When AC is on, Radiator fan does not come on. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. My cooling fan is not acting as it should. If the a/c doesn't run then the cooling fan isn't needed. What I have found so far: Fan does cycle at medium or high speed with AC or Defrost turned on. 2012 eco. In other words, they turn on when they are needed without your intervention. Most fans should come on when the coolant reaches about 200 to 230 degrees. The link below is the connector view for the radiator cooling fan motor. Also Know, does radiator fan affect AC? Shouldn't radiator cooling fan … This vehicle has a 2 speed cooling fan that can operate on one speed and not operate when commanded by the A/C clutch control from the PCM. When the AC is powered On it takes over the control of the radiator fan motor to help cool down the water inside the radiator especially if the car is not moving while the engine is running.. hey i saw ur a little familiar with wiring the a/c fans. It only comes on when temperature rises to operating range. If the fan does not come on, something in the control circuit is defective. Cooling Fan … Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. @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. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. (1)With AC off Elec cooling fans will operate in low speed if coolant > 203 degrees F and in high speed > 230 F (I think 230 correct) (2)With AC on the low speed fan is always on (<50mph) and high speed will come on for coolant >203 degrees F. Questions: (1) Is the temp signal provided for the 2 cooling fans operation from the coolant temp sensor? Yes, a broken radiator fan can cause the air conditiong to stop working. 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