Heater noise issue seen from under bonnet

[celica]

I found a video on YouTube which is similar to my heater noise under the bonnet, where you can see the tube move

Inside the cabin it sounds like it is pulsating

Anyone else do this, so you know the fix or issue?

https://m.youtube.com/watch?v=nm4uzi-WSNY

[Horizon]

I would suspect the heater solenoid valve or the auxiliary waterpump, try pulling the plugs to see if the noise alters or stops, the solenoid valve block is usually mounted on the inner wing.
If a selenoid has a bad coil or coil feed it can pull in and then drop out / chatter , if the auxiliary pump for the heater system is energised when the valve is powered and then the solenoid drops out causing the valve to close this may be causing the problem

[celica]

Thanks

It’s a bit hard to reach anything from the car on drive vs up on the ramps

Will get garage to look at it next time