Cycling noise when car is in standby

Coolant valve or brake pump

 

No 'or' about it, that sound is the coolant control valve.

As a forum search term, that will find you plenty.

 

Usually you can grab one off of a car that just got to the junkyard this is one of the parts that people replace trying to get the car to wherever they think they're trying to go with it A lot of these Prius you find in the salvage yard they've had most of these parts replaced trying to get back to some form of normalcy then they give up they don't take the parts back off they've already paid to put them on and bought them so they just send the whole car to LKQ for somebody to like me to come along notice that all the parts are new and by the parts replaced you can almost figure out what they were trying to chase so always look at that when you're at LKQ or any junkyard a lot of these cars have lots of new parts are replacement parts on them that's why they're here they couldn't get them to sync up harmoniously and make the car work like it once did and so now they're just out the parts and taking it as a loss so you come along to the junkyard and just remove the parts cut the hoses whatever it takes to get the parts out quickly throw them into your bin and that's how you wind up with several cars and parts in your garage people are buying these parts for you everyday to come get for pennies on the dollar. But at your job you make $140,000 a year so it seems quite moot going out to the junkyard on a Saturday when you making all that bank.

 

How about the brake booster pump ??

 

I think it's a little bit too clicky for the booster pump that's more of a whining noise if you will a whirring Plus all you got to do is whip open the hood while the noise is going on reach your hand down and touch those two devices and go from there.

 

Post #1 included a video, and I know what both things sound like.

 

So is this normal?

 

No. The position sensor in the coolant control valve is flaky, and the ECM is continually sending the valve back and forth and back and forth and back and forth back and forth and back and forth and back and forth back and forth and back and forth and back and forth trying to get the flaky position sensor to say it's in the right position.

We only have a few hundred older threads about when this happens.