Originally Posted by
tabetha
You can get this noise WITHOUT air con, as my dads does it(used to be mine), and the AC is disconnected and empty.
tabetha
Then I would stick to my story #2..... OR.....
Maybe some air trapped inside the engine cooling system. (That would be lucky). It does not hurt to change the coolant and might as well do a cooling system cleaning (i usually do once in every 2 years on my cars) as a last hope for resolving the issue. If not, back story #2...
Hope this helps...
Cheers,
R.