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Q: my truck heater will not heat. on 1996 Chevrolet 3500 Pickup

Installed thermostat with a 195 degree temp.Replaced water pump and coolant. Ran water threw heater core, both sides. still no heat to heater core. both lines to core cold. warm day ran truck for 30 min got engine to 200 degrees still lines to core cold. radiator nice n hot. don't see coolant circulating back to radiator from heater core.
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Thank you for your help. I did find the problem this truck had a different engine than the original and the guy who insalled it routed the heater core wrong. once again thank you for your help.
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