Faults:

Fan Clutch - Replaced under Warranty.

Rear Axle seals - @ 60K miles, Out of Warranty cost $400.

Rear Brake Light Driver Side - Corroded connection, have two notice letters, had first repair done under warranty, now that I did one post warranty (but withing mileage limit/age listed in letter), hope that GMC will refund the parts repairs That I had to Purchase from 2 dealerships to effect repair. Cost $140.

Air Conditioning Have had the control module replaced while in warranty. It has gone out again. It seems that the repairs are focused on the effect, not the cause. Another blog reported the cause of the problem-- a faulty vacuum module attached to the transmission that supplies vacuum to the A/C module is allowing trans fluid/mist to travel via the vacuum hose that supplies vacuum to the module, causing intermittent problems/ shorting out. In my case, so far, the dealer hasn't diagnosed the cause, the vacuum canister. I hope GMC takes responsibility for the faulty vacuum part and fixes the problem.

Electrical -

This vehicle eats batteries. Have had one replaced under warranty. Another one post warranty. NOTE TO OWNERS WITH ELECTRICAL ISSUES -- Have the battery load checked. I have experienced similar weird electrical issues as reported in other owners comments. Have the battery thoroughly load checked. In my case, the problems start when the battery is beginning to fail -- shorting of a cell prior to battery failure. Next time I will consider replacing battery with one rated larger than spec. With everything being electrical/computer controlled, batteries are being worked very hard.

Faults:

Persistent problem with the fan clutch. I had it checked with the dealer twice, under warranty, they claimed they fixed it. The first time they claimed it was a computer reprogramming issue, the second time I was told it was normal for the car to behave this way when cold. Now at 66,000 miles I am told the fan clutch can be replaced at a cost of 700 dollars (parts and labor). Oh, did I say the dealer told me it was no longer under warranty. I suspect this is a design flaw or equipment reliability problem and GM does not support its customers. I purchased a Cadillac CTR a year before the Envoy and I will give this issue strong consideration when I next purchase my next vehicle. I am not stupid and a Google search in the Internet revealed numerous complaints about the fan clutch.

General Comments:

See above!