I put a new fan in my Ford Focus the other day and the first day it didn't work so I took it to my mechanic and it's been working since he said he hasn't done anything so I'm not sure if that's true or not, either way my fan works but I unplugged my battery today and hooked it back up and now any time I run my ac compressor the fan kicks on and runs the whole time it's on. To my knowledge I thought it was only supposed to do it in spurts or is that when the vehicle is isnt up to full temp. I let my car sit and idle to full temp and let the fan kick on by its self per radiator temp and then after the cycle I flipped my compressor on and my ac fan ran the whole time it was on and then for 30ish seconds after it was off it only has one fan on it for the condenser and radiator
The reason the cooling fan comes on when you turn on the A/C is because in front of your radiator there is another part that looks just like a radiator called a condenser. The condenser works the same way that the radiator does in that it radiates heat to the atmosphere, and it does this more efficiently when air is moving faster through it. The scientific way that A/C works is that it doesn’t introduce “cold” into the car, it actually removes heat, the condenser is how it does that mechanically. Sounds like everything is running exactly how it should to me.
Bonus points to the fact that by knowing this, if your A/C ever gets warm when you come to a stop then gets cold again as you get up to speed, you know to look at the cooling fan 👍🏼