Coolant Temperature Gauge
 

I've noticed on my 1999 A6 Avant that this thing like to drop then go back to normal temperature alot. I had this same issue when I had a 1996 A4 but never really questioned it. My car is not overheating or anything and runs normally as it should, should I be concerned over this? Thanks!

-Michael

PS...Does anyone have a reliable mechanic in the Silicon Valley area?