The most commonly cited problem with the Buick Rendezvous are leaky manifold gaskets and other engine issues, according to CarComplaints.com. The model year 2002 Buick Rendezvous has the most complaints.
Consumers also report leaking head gaskets with the Rendezvous as well as issues with air conditioning failure. Less commonly reported problems include breakage of interior parts, failure of window motors, and electrical issues. The model year 2002 has by far the most complaints with the following year's model also cited as highly problematic. The model years 2004 through 2007 have far fewer reported issues and have much more favorable ratings.
Some Buick Rendezvous' develop coolant and engine oil leaking problems. Internal coolant leaks may occur causing a mix of the engine oil with the coolant. If the engine runs with a mixed coolant and oil, it may result to engine damage. Mechanics address the problem by replacing the manifold gasket.
Some Buick Rendezvous owners report having experienced problems when starting their vehicles. The problem may result from a faulty flywheel, diagnosed by the lighting of the check engine indicator. Consequently, the vehicle produces a peculiar sound when idling. Ultimately, the car fails to start, even when the battery has sufficient charge. The possible causes of the problem are a torque converter clutch failure or a clutch stuck in the wrong position.
The front brake rotor in a Buick Rendezvous may wear and lead to pulsation problems in the brake pedal. Mechanics correct the problem by replacing the brake pads and the front rotors. Some drivers report an illumination of the check-engine light. This occurs if the gas cap is loose or worn out.