Does the 99 Tahoe have a engine shut off if low on coolant?

No, the 1999 Chevrolet Tahoe does not have an automatic engine shutoff system triggered by low coolant levels. While a low coolant level can cause overheating and potentially damage the engine, there's no built-in sensor and safety mechanism to automatically shut it off. The warning system usually relies on the temperature gauge and potentially a warning light to alert the driver.