One problem related to coolant leaking has been reported for the 2005 Chevrolet Tahoe. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Tahoe based on all problems reported for the 2005 Tahoe.
The engine has coolant leak at head. Gm is aware that the engines were made with faulty heads by a company called castec that are prone to failure in the oil return ports. They have a bulletin but are unwilling to assume any responsibility. This repair is so costly that a complete engine replacement is more feasible. The average time of this repair seems to be only 100,000 miles.