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Q:

heat/ac fails but returns with adding coolant . where is the leak ? on 2004 Chevrolet Tahoe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
new water pump / no sign of leak on ground /
(1) Answer
any number of a hundred places. you need a shop to pressure test it for you to define the leak and where it is coming from.

Roy