What's the 2001 Chevy Tahoe coolant type?

The 2001 Chevrolet Tahoe comes with a manufacturer's proprietary blend of a red / orange coolant, but with that said, it's certainly not a picky beast. Many drivers report using A50/50 blend of just about any F-TYPErom a reputable brand -- Dex-Cool should be perfectly fine. The most important thing to note, however, is that You don't mix coolants of different varieties -- doing so can prevent normal operation and harm Your engine. If there's any question about what coolant is presently in Your system (and since You're running a 2001, there's a good chance the coolant has already been swapped), it's recommended that You do a full drain-and-fill. Different types of coolant can sometimes react with each other and create a Jello-like substance, which is predictably pretty d**n bad for engine operation.