Cadillac Repair: 1992 cad coup 4.9 eng, gasket leaks, combustion chambers

Question
loosing water and can not see where it is leaking. Checked all hoses and no
visible leaks. Car runs fine 17 miles per gal 73,000 miles. Thanks Carl

Answer
The most common fault is small head gasket leaks which causes small amounts of anti-freeze into the combustion chambers a little bit at a time and is burned out the exhaust but not enough of a leak to see white smoke from the exhaust. Very common on this engine.