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thanks for your response. I will do what you recommended.

Thanks ironman4real. Will do that. Is there a possibility of blend door actuator being bad?

whats up guys and gals? Im new to this forum so please be patient if im doing something incorrectly. I have a 1999 Tahoe Lt four door 4x4 with 5.7 litre v8. My heat has stopped working completely. Both hoses going in and coming out of heater core are hot when at normal operating temperature...