Got a 96 Villiger that always has a loud clicking noise everytime the heater is on. Its coming from the engine but cant pin point it. Any suggestions or answers? thanks

Try the thermostat. Or the IAC valve.

Try the thermostat. Or the IAC valve.
Hey thanks I will check into it by the way what is the IAC valve and where is it located? Thanks again

Center of the engine rear near the fire wall ontop of the intake manifold.

Center of the engine rear near the fire wall ontop of the intake manifold.
Hey thanks for the info. I got more details about the clicking noise. It only clicks when the heater is on the defroster setting. And when I pop the hood it starts when the fan is activated. Does this help alittle more for ya. Thanks

It sounds like the relay is clicking if its in the car and if its from the engine you may a fan blade hitting something. You may need to turn off the van a few times with someone else so you can check for the noise to see if it slows down when its off.