Residual (Parking) Heater Noise

[5wany]

Hi

I have noticed that there is a slight pulse (thumping) sound from my residual park heater.

(This is the heater that once you stop the car you press the fan button and the residual heat from the engine keeps the car warm for 15min or so.)

You can only here the noise if the fan is on its lowest setting (1 bar), its a cyclic noise, you here it about every 2 secs. Once you put the fan up the fan noise drowns out the thump/knock noise.

Just wondered if this is normal or if other forum members fans run silent?

Car is still under warranty - so will contact Dealers, just wanted info from others in case they try the "Oh sir thats normal" routine.

Cheers