Chevrolet Colorado Heater Not Working

On Friday I Shut My Truck Off. When Out Of Town For The Weekend. Monday Morning When To Start Truck And Notice Thermostat Was Reading High...

Husband Changed Blower Resister And The Plug. The Blower Motor Is Getting Power, Checked It With A Tester And He Straight Wired The Blower...

So, I Recently Took The Carpet Out Of My Truck, And I Took The Seats Out And Everything. The Heater Was Working Before That Just Fine Never...

Thermostat Has Been Changed Heater Core Flushed Out Antifreeze Is Full What Can It Be? Is There A Wire Or A Fuse I Should Be Checking? The...