Hi Chum Lee,
The Coolant tank for the radiator has the correct amount of antifreeze solution and the engine temp gauge did not increase, just stays at it normal operating level.
The sound increases (gets louder) with added accelerator pressure and decreases when accelerator is released (removing my foot). In the past if heat started to increase the fan would come on but it was a set frequency that did not change with speed or engine power demand. We turned off the air-conditioner, did not use defrost and the sound still occurs.
It sounds almost like liquid spraying (Shhhhhh), but there isn't any evidence of any oil, antifreeze, or transmission fluid. No leaks.
If I pull over to check it out the sound stops so I can't determine where its coming from.
I am stumped. Don't feel I have enough information to communicate to the garage.