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