Normally headgasket leaks are caused by a cracked or warped head. This can be from many issues, to numerous to list, but normally it involves failure of a $.98 part. If the mechanic who worked on it originally has any kind of business ethic, he/she will discount the money paid for work already done and make the correct repair. GM V-6 heads are fairly cheap from junkyards, and they should be able to get a new head and install it for under $1k. (especially if they do as I said, and deduct the cost of the incorrect repair)





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