I was wondering does the 2010 Prius cooling fans have 2 speeds? I am still having overheating issues after replacing the water pump and thermostat. I used oem parts. The fans seem like they are not spinning fast enough. I was driving with the obd reader and looking at the ECT temp and my over heat light comes on at 213f.
I Believe those fans are variable speed or two speed or more than low so you need to find out why that is when your air conditioning is on the fans should be on max so you should see what your car when it says it's at 2:13 and you pull over if you were to turn on the air conditioning does the fans get real loud then they weren't on high when the car was on 213. You need to get that sorted so maybe the temp sensors in the radiator or the head or the block or whatever aren't sending correct information on a 2010 Gen 3 those fans could be $300,000 mi old it might be time.
The fans are two speed and there are two coolant sensors. 213f is not enough to trip a warning so it must be the second sensor. If the car is moving you should not need the fans this time of year. However ac on will turn on the fans regardless of coolant temps. You need a bi-directional scanner to test both speeds. An obd2 scanner like “Car Scanner” can read both coolant temps. While unlikely a sensor could be bad. You should also verify coolant flow into the reservoir when the engine is heated up over 185f or so. Cheap water pumps, bad wiring, relays or fuses could be a problem.
