Also Know, does radiator fan affect AC? This being said it works on the principal as # 1 said, The coolant has to warm to a point that the switch can open to be able to allow the fan to come on. Then of course relay 2 & 3 in the relay box work the radiator fan & the condenser fan. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. If the a/c doesn't run then the cooling fan isn't needed. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). 2012 eco. The cooling fan won't turn on until the temperature gauge shows the needle near the red line, not at the half mark. What I have found so far: Fan does cycle at medium or high speed with AC or Defrost turned on. Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. With engine at idle/operating temp and parked, AC and defrost not turned on: Fan does not turn on at all. Most fans should come on when the coolant reaches about 200 to 230 degrees. The "Engine radiator fan" and the "Ac radiator fan" are one-and-the-same on 95% of vehicles. It only comes on when temperature rises to operating range. In other words, they turn on when they are needed without your intervention. When AC is on, Radiator fan does not come on. 2006 PT CRUISER - NON-TURBO. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. @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. 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.. its 108 plus here in texas and the factory low setting is not cutting it. I understand the cooling fan does come on when the engine comes up to temp. Shouldn't radiator cooling fan … No overheating problem at all. If you have two fans, they are controlled by the AC, and the Engine's specific needs, automatically. If the fan does not come on, something in the control circuit is defective. 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. hey i saw ur a little familiar with wiring the a/c fans. The link below is the connector view for the radiator cooling fan motor. Fan does not turn on at any other time that I know of, or that I can hear while driving. 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