When ever I have my heater on,and I go to turn it off their is a delayed click noise under the passenger side. Is this suppose to happen? Is it common to happen, or is their something wrong? I had a 06 which never done this. Now I have a 08 scab 4.6

 

Turn your high beams on and off and you'll hear it as well. The fuse panel is on the passenger side by the passengers right foot. That's a relay clicking, and it's normal. I'm not sure if I've heard mine click with the heater, but I'm sure it does. I also hear it click when the air compressor for the horn kicks on.

 

I dont think its that kind of a click though? Its kinda like a pop if that helps, its quite loud. It could be the same thing and Im just going crazy.

 

Blender door closing, maybe?