Source of 'crickets' noise?

[Exiwolfman]

Originally Posted by Squash

OK scrap that, it sounds like it's coming from underneath the car, towards the rear axle? I finally got a good recording of it as well.

https://www.youtube.com/watch?v=mnlDKfoVccY

Another interesting thing I noticed is there is a change in the engine noise preceding the chirping sound.

to sounds like belt slip possibly water pump area but if u say its from the rear have a look at the gaskets that connect sit between muffler u could have a leak ..but so sounds like belt area from vid.