Check both of your window switches.  Occasionally I've had them stick in the up position and the relay keeps clicking off and on.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Friday, July 01, 2016 6:36 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Strange ticking -'88 GL

On the way out of town, gassed up, airred up, freoned up (actually HFC 152A), loaded up - every thing is perfect, then this ominous  ticking starts. Regular as can be, about every 8-10 sec. It doesn't change with speed changes or engine speed. Loud enough to be heard over the den of the a/ c blower.

Anybody got some idea what this might be? Put of my trip 'til I get to the bottom of it!

John