I don't want to hijack the whistling throttle thread but...

[westfield]

My ex whistles to me every morning....The whistling sound comes from the passenger side in the engine compartment. Usually happens when it is cold and goes away when it warms up...Probably a vac lead but any ideas where a usual suspect might be on the passenger's side ?

Thanks

 

[FIND]

alternator. Probably just because of condensation when it gets cold.