I am driving a 2006 Focus wagon. After 10-15 minutes running, I begin
hearing a whistling which sounds like an air leak (actually, it sounds
like a very small police whistle). It can be heard loudest under the
dash on the driver's side, and its pitch rises and falls with the RPMs
of the engine. It continues to grow louder with further driving.
I've had it to two dealers three different times and nobody seems to be
able to reproduce it. Any ideas?
Are you asking for help in finding it yourself?
If so, locate the vacuum line into cabin and disconnect, plugging the
port to engine.
If it stops, reconnect and note if the sound changes with changing heater
controls. Then locate lines to heater box and check what happns when
they are disconnected and plugged.
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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