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My 2005 Chevy express 3500, I changed the heater core because it was leaking, no on 2005 Chevrolet Express 3500

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac of Conyers Truck & Auto Repair
My 2005 Chevy express 3500, I changed the heater core because it was leaking, now I have no heat. Did I do something wrong?
(1) Answer
Did you have heat before? If so,check for : kinked hose, hoses switched, did not remove packaging plug before
installing core, not full of coolant or air in system.