Guys I need everyones input. Weird fan engagement, car run cool, like electric is on

Ok guys this is very strange. My car would run warm going up hills and not cool off after.

I have a fan and spacer bolted right to the water pump but I always thought the fan wasn't moving much air.

I was out driving today and the temp got up to 215F and all of a sudden it sounded like a huge electric fan turned on and it was like a hurricane of air moving through the radiator.

There is no electric fan on the car right now. I then turned off the car to see what is going on. I can't find anything. I turned the car back on and the fan isn't moving much air back to normal. Then the temp gets up to 210-215 and it sounds like a huge electric fans kicks on and my temps quickly drop to 180F.

What the heck is going on? My water pump has a pulley with 2 grooves one for the alternator and the other comes from the crank and then the compressor and waterpump.

Is there such thing as a thermostatically controlled pulley? Could it be the in the waterpump itself?

It is like the fan is only turn 1/4 speed and when this kicks on it is turning full power. My fan is bolted directly to the water pump.

Please let me know. Thanks.

'.......That's pretty funny guy. You have a clutch fan. Your clutch unit is wacko......"

Actually sounds like it's working just like it's supposed to. All the fan clutches I've picked up in the past couple of years don;t engage until around 210-215 degrees. YOu can set them to engage around 190 by tightening the coil spring in the front 1/2 turn.