I took my 2003 Trailblaser to SSC to investigate an air conditioner issue. Problem was it did not cool well at idle and low speeds. SSC investigated, added a touch of freon. Then explained that the problem could be the fan clutch, but the condenser coils were filthy, filled up with bug goo. Suggested I clean the coils myself and see how the air conditioner worked. If it was still not cooling, then bring it back and they would investigate the fan clutch further. I cleaned the coils and the air conditioner works fine. SSC could have ripped me off by charging for this and that, but they didn't. They are honest, hardworking folks who have all of my business.