Clicking noise in dash

[johnnyapollo]

I'm now also subject to a clicking, in my case coming from underneath the passenger side dash. It sounds like a relay clicking on and off slowly (about every 20 seconds). It's most noticeable at idle, but does it all the time while driving (and no it's not the fan). Any ideas on this one? I'm going to get behind the glovebox this weekend to see if I can find anything.

-- John