Hi guys,

Quick question for you - is there a wiring harness that goes through the a-pillar or through the portion above the door but below the roof (its covered with foam/vinyl)?  The reason I ask is periodically I will hear a buzzing, kind of like the sound of high voltage jumping from a wire to a ground coming from the area above the passenger door but below the roof.

Is there a wiring harness there that could have a nicked wire?  This does not seem to be affected by the volume of the stereo.

 

-chaseincats

I don't believe so

23 minutes ago, Patcon said:

I don't believe so

any idea what that buzzing could be?  it really does sound like power buzzing, its really odd.

 Can you pin down "periodically"?  Maybe a smell, RPMs, road surfaces, speed, any accessories turned on, hot fuses, or insect access points?

Mud daubers? 🙂

3 hours ago, Patcon said:

Mud daubers? 🙂

Haha!   

He needs to roll the windows up when he parks that thing!

7 hours ago, Mark Maras said:

 Can you pin down "periodically"?  Maybe a smell, RPMs, road surfaces, speed, any accessories turned on, hot fuses, or insect access points?

When it does happen I play with all of those in my head and nothing really seems to add up.

Interesting people saying it could be a bug.  It does sound like it could be something angerly buzzing in there, but I don't understand how something would enter that area if that is indeed the case.

Seriously, It could be a mud dauber. In Florida they’re terrible and that’s what I sounds like. If that’s the case they don’t live that long. How long have you heard it?

6 hours ago, chaseincats said:

When it does happen I play with all of those in my head and nothing really seems to add up.

Interesting people saying it could be a bug.  It does sound like it could be something angerly buzzing in there, but I don't understand how something would enter that area if that is indeed the case.

There are two rubber cups that surround the hatch hinges, quite often they have cracks in them from age and heat, it would be easy for insects to climb in there.

It could also be a vibration but that would usually show up at the same RPM range.

Where does the bottom of the A pillar open to? The hollow area where the door hinges bolt? The hollow area where the fresh air vents connect the is the upper support under the fenders?

So it's sounding like the resounding conclusion is some sort of very short-lived bug.  Quite frankly that sound/how often it happens kind of makes sense.  The buzzing really doesn't last all that long and will go away for months.  I'll start taking a look around the car to find openings that may need shuttenings (which I'm dubbing a word).

Does anyone know where the fresh-air opening is for a 78?  @grannyknot The rear hatch plugs have an unbroken piece of duct tape over them as a seal.

There are open air  side vent actuators under the dash just above the side kick panels