Check the climate control systems from both rows of seating, confirming that all adjustments to temperature, distribution and fan speed respond favourably. Notably, some owners have reported sporadic performance from the air conditioner system, which can blow warm air occasionally as a sign of a refrigerant leak. An Audi mechanic is the best person to check into this problem, if you note it.
Though relatively uncommon, leaks are possible from the Q7’s engine, transmission and differentials, so be on the lookout for spots beneath where the vehicle was parked, for signs of drippage or seepage beneath. Get down low and use a flashlight for a closer look, or have an Audi mechanic make an assessment on a pre-purchase inspection.
Check the panoramic roof, if equipped, for proper operation as well – from both the glass panel and the soft sunshade. It’s not uncommon for the latter assembly to come off of its track, causing issues and requiring repair. Some issues have been reported with panoramic roof frames and seals on earlier models, with Technical Service Bulletins issues to address leaks. Find signs of leakage by checking closely for water staining in the ceiling liner, signs of sogginess in the carpeting under the front driver and passenger footwell area, and even inside of the dome-light assembly. In some cases, this water leak can wind up soaking the Q7’s fuse block, causing a world of issues with electronics. More reading about this rare but serious problem in the first bit of this thread.
The Q7 owners community has done a good job of documenting premature tire and brake wear issues reported by owners, which has even resulted in an attempted (but dismissed) class-action lawsuit. Here’s some more reading. Note that tire and brake wear are largely a function of locale, driving style and vehicle maintenance, though these components should be checked closely on a pre-purchase inspection. The Q7 also has an electronic system to advise owners of worn brake pads, so look for the warning light in the driver computer.
Be on the lookout for wonky electronics of any sort – including warning messages, funky operation from things like locks and window switches, non-functional lights, hesitation in starting the engine and more. If any of these are present, begin diagnostics starting with the battery and charging system. The Q7 is one of the growing list of complicated vehicles that suffers battery drain issues as it ages, meaning having a healthy and fully-charged battery becomes more and more important. This vehicle is a good candidate for trickle-charging when it’s going to be sitting for extended periods.
