Hi I I have Audi 2..5 v6 tdi, when driving at speed of 10mph a warning beeps and a yellow sign showing mph. It beeps every time I go over 10mph and doesn't beep again until I Stop and manoever off again can you explain what this is for

Read your owners manual on how to set or clear your speed warning. There is nothing wrong with your car.
IIRC, the speed warning is zeroed by holding down the left instrument cluster button for more than one second when the vehicle is moving faster than 3mph. The icon will show with a diagonal bar through it indicating the speed warning is turned off.

It's an yellow warning indicator lamp. It lights when brake pads are weared. Now it's time to replace the used brake pads!

What noise are you referring to. Is it engine noise, or wind noise, or road noise? Is the noise there at cruising speed or just when you are accelerating? Please clarify.

It's an yellow warning indicator lamp. It lights when brake pads are weared. Now it's time to replace the used brake pads!

you lucky person,you have fitted at factory, a speed warning buzzer,which you can set yourself, to give you a warning that you are exceeding the limit(you set)NOW, i cannot, for the life of me, remember how to set it, but it is in the handbook.

You have set up in yours bord computer a speed alert (mph) Nr.1 !

Your SPEEDING over the NATOINAL SPEED LIMIT,your car is fitted ,to warn you.SLOW DOWN lol col leeds

Does it beep when you start driving?

If so, you might have your speed warning set too low. These cars have 2 speed warnings. Speed warning 1 resets each time you turn off the ignition. Speed warning 2 is stored in the memory. It sounds like you have a problem with no.2, but it's weird because I'm pretty sure the warning has to be set to at least 3mph. Your owner's manual shows you how to set the speed warnings under "controls and equipment - driver information displays."

The temperature reading is just the ambient (outside) air temperature.

Hope this helps.

It means the current owner has set a speed warning, this can be set to beep at nearly any speed. It can be done through the vehicle following the owners manual. It is normal and more importantly can be turned off.

Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.