V36 Coupe Clicking Noise On Hard Acceleration. Help?

[bosco]

I am wondering if anyone experienced any clicking sound around the cluster during hard accerlation - above 3000 rpm? Is it normal? Sound is definately coming from dash, not from engine.

[xfuzion]

Does the frequency of the clicking change with the revs?

If so, I had that too, though it seems to have gone away.

According to the g37 forums, you'll need to backflush the heater core . Apparently it's a common problem: http://www.myg37.com/forums/g37-coupe/199564-clicking-noise-on-hard-acceleration.html

[bosco]

Yeh it comes and goes. How do you flush the heater core?

[xfuzion]

I'm not sure, I haven't done it yet...

From what I've read, it's a bit difficult to do it without some kind of high pressure water source