[HummerJim]

I had the same noise, especially on cold start ups and solved it by spraying WD40 in the shaft of the engine belt tensioner pulley. The noise would come back after about 10 days and I would spray it again. Hummer replaced the tenison pulley under warranty and it never made any noises again. There's a thread about this the first winter the H3 came out, I think by F5stop, and it boiled down to a handful of H3s had noises from the tensioner pulley.