Why are pipes cold after bleeding system?

Is this a basrboard radiator or what? Is the pump running ?

More info - our system is heated by an outdoor woodburner, a taco pump that is new & running. I got all the leaks tightened down and stopped. I started the taco pump (it's still running), and the pipes and heaters began to work perfectly. After a few hours, it began to cool down, and now the pipes are barely warm. It doesn't feel like it is pulling the heated water from the stove. Anything I may be overlooking?

How much pressure is the system under. If you don't have at least ten or so pounds, the system won't circulate properly.

Is there a tstat on this system and what is your water temp in the boiler?