1978 Continental “Buzzing” Under Dash

Bill,
I get a fairly loud intermittent “buzzing” noise coming from underneath the dash after the vehicle has been sitting in the sun for a while, it also occurs when I first start the car up, even in the garage, but only lasts for a very short period of time.
Regards,
Bruce
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Greetings Bruce –
Not being there to hear that noise it is difficult to point a finger at the cause. Someone needs to step out of the car when the noise is sounding to make sure that is actually coming from under the dash. There are so many tones to imagine but I can suggest that you check the transmission fluid level as some C6 transmissions will buzz in neutral with the engine running if they are low on ATF. The transmission fluid must checked with the engine running.
Sincerely,
Bill