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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,863 Posts
If it is related to engine vacuum, does depressing the brake pedal slightly during the whistle change it or eliminate it?
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,863 Posts
I have used a body shop (painter's) masking tape to tape over seams and gaps in the body panels, cowl, glass and firewall to try and locate a whistle or buzz caused by wind. Apply over one section at a time. The tape won't harm the finish.
 

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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
Joined
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23,863 Posts
Try to locate the source from inside the vehicle. Does the passenger hear the same noise from the same direction? If the passenger can get up and listen to the base of the windshield/cowl area or down by the floor, does the aural perspective change at all? Is it directly out front under or in front of the vehicle? Does opening a window slightly change the noise? Does it happen in rain or does temperature have an effect?
If related to engine speed, it may also occur at a standstill by bringing the RPM up. If it is transaxle-related, it may occur on a lift in gear at speed while searching for the noise source.
If it is wind whistle, the body tape-off method may help. Loose rubber splash aprons, weatherstrips, trim mouldings and body gaps can act like a reed and are common whistlers. There is a large high-pressure at the front of the vehicle and low-pressure at the vehicle sides and rear.
 
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