One problem related to manifold/header/muffler/tail pipe has been reported for the 2004 Buick Rendezvous. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Buick Rendezvous based on all problems reported for the 2004 Rendezvous.
Vehicle lost coolant secondary to "blown" lower intake manifold gasket. Gasket replaced, by certified gm dealer service center, engine continues to exhibit overheating. Multiple attempts to 'purge' cooling system to no avail. Vehicle in day 8 of "hospital stay" at this time.