Santa is bringing an early present for owners of certain C7 Corvette Z06s.
General Motor told dealers this week it will begin offering new extended warranty coverage on 2015-18 Z06s because some cars “may have a condition where the vehicle may overheat and enter a reduced power mode when driven on a track at sustained high speeds in high ambient temperatures.”
Ever since it debuted in 2015, some Z06 models have experienced overheating on the track, and GM tried to alleviate the problem in 2017 by changing the hood intake vents and cooling system, with only limited results.
The revised warranty will cover 2015-18 Z06s for a period of 7 years or 72,000 miles, whichever occurs first, from the date the car was originally placed in service, regardless of ownership. In addition, owners or lessees who have already paid for repairs are eligible to have their money refunded.
To fix the problem, GM is telling dealers to install an updated radiator package and to update shift point calibration software for Z06s with automatic transmissions, at no charge to owners if they provide proof of the overheating problem via a diagnostic code, photos, or video. (Overheating has also been reported in cars equipped with 7-speed manual transmissions.)
Class-action lawsuits have popped up over the years against GM because of the overheating problems, which surfaced early in the life of the 650-horsepower behemoth Corvette.
In fact, back in October 2015, Motor Trend itself reported the issue during its Best Driver’s Car competition, leading to a DNF (Did Not Finish) for the Z06. That car entered limp mode repeatedly during testing by MT, and Chief Engineer Tadge Juechter explained the culprit back then in this way:
“One of our pre-loan checks is to bleed the intercooler circuit to make sure there is no air in it,” Juechter said. “Some customer complaints about overheating Z06s have been traced to improperly bled intercoolers. [However, that was not the exact issue; instead] the technician doing the work plugged in the electrical connector for the intercooler pump and it seemed to seat and ‘click’ into position, but the secondary latching mechanism did not fully lock into position leading to intermittent operation.”
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