One problem related to engine cooling system has been reported for the 1999 Chevrolet Tahoe. The most recently reported issues are listed below.
The heater hose is attached at the intake manifold with a quick-connect fitting that is made of pot metal. When this fails (and it is inevitable due to the type of metal used) the engine loses all coolant and leaves you stranded. There is no "quick repair" for this failure. Older engines had a connector into the intake manifold made of steel or brass which was more reliable and usually did not break off flush with the manifold. Nlm.