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.. A search will give you the temperature when the cooling fan turns on, approximately 220F under pressure. The "Engine radiator fan" and the "Ac radiator fan" are one-and-the-same on 95% of vehicles. like what wires to jump for them to work only on high when they come on. My cooling fan is not acting as it should. Most fans should come on when the coolant reaches about 200 to 230 degrees. its 108 plus here in texas and the factory low setting is not cutting it. Also Know, does radiator fan affect AC? Electric Radiator fans do not come on when engine is hot nor after turning off, will only come on when AC is turned on. The link below is the connector view for the radiator cooling fan motor. With engine at idle/operating temp and parked, AC and defrost not turned on: Fan does not turn on at all. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). It only comes on when temperature rises to operating range. Shouldn't radiator cooling fan … Fan does not turn on at any other time that I know of, or that I can hear while driving. Cooling Fan … If the a/c doesn't run then the cooling fan isn't needed. 2012 eco. 2006 PT CRUISER - NON-TURBO. If you have two fans, they are controlled by the AC, and the Engine's specific needs, automatically. No overheating problem at all. What I have found so far: Fan does cycle at medium or high speed with AC or Defrost 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. Yes, a broken radiator fan can cause the air conditiong to stop working. 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. i was wondering if u can help me wire the Ac and the cooling fan to operate on high when they active. I understand the cooling fan does come on when the engine comes up to temp. Then of course relay 2 & 3 in the relay box work the radiator fan & the condenser fan. 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. (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? 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