if your car has air con on it while the engine is running it will be the aircon pump switching on and off hope this helps you out nate
If clicking while trying to start then might be a bad starter. If clicking while running, then might be valve/lifter noise.
Change the blower fan speeds to see if the noise changes. It is possible that the fan is still running while the heat is off, and the fan is rubbing.
It means you're about tho spend a lot of money on a new motor.
Look at the half shaft.
== == == == Anyway, that should take care of the clicking. It worked for me. == ==
Clean the battery cables.
it's probably the head gaskets.
Please be more specific ... heater gives off heat, then cold air OR The heater fan runs for awhile then stops running
A small amount to keep the pilot light going.
Well, it happens to me once in a while so i dont worry about it. If your really that worried you could see a doctor.
My guess would be that the clicking sound is the flasher relay operating. Its a mechanical switch in a metal housing and they all do that clicking thing. The question I would have about that is why it wouldn't be clicking at times. This relay iis located with the fuses and is a plug-in inexpensive item to repair.