Sorryto hear about the poor service you are receiving. It seems that service is a function of the dealership itself and not necessarily a reflection on the product. I've owned GM vehicles for decades and have been quite pleased - presently my 92 suburban with 160,000 miles is still going strong with only a nagging radiator issue (leaks spring up at 50,000 miles). However, incompetence or just poor customer service does occur.
I hope you've contacted Hummer directly and provided them some feedback on these issues.
JJ
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