I recently purchased a used 2004 intrepid with about 85k miles. During the test drive everything seemed fine, but I wasn't sitting in the car when the engine was started, I was standing outside and it sounded alright. After getting the car home the next morning I started the car and after starting it had a repetitive ticking noise, similar to that of a turn signal. It would tick rythmically for about 30-45 seconds, stop briefly, start again for another minute or so and then stop and be done. It sounds like it is coming from behind the dash but I have no idea what it might be. I tried starting the car without the A/C on thinking that was the problem, no change. Also, I took it through inspection and it passed with the OBD coming up clean.

Advice?