Hia, I have an Astra 2.0T SRi. Every time I drive off, I hear a slight sort of gentle clunk, from behind the area of the rear dash, drivers side. This occurs after about 10 seconds of driving. Maybe "clunk" is the wrong word as it is not a harsh sound. Someone told me it's the ABS / power steering re-purging, and is normal. As anyone else had this on an Astra (Mk5)? Don't know if this is particular to the SRi or all astras. It seems to be regular IE does it every time, not when the engine is idling, only after I drive off. Any feedback appreciated. Cheers Rod