Obviously no flow through rads. When you bled (presumably water coming out) you are letting hot water enter rad so they get warm. Presumably you drained (partly or full) the system to change the pump and you have probably dislodged 10 years worth of sediment which is blocking the flow or more likely the return to these rads.
Close both valves on rads and remove rads. Put water catcher under one valve at a time and open valve, this will tell you which pipe to the rad is blocked i.e. the one that doesn't deliver any water when valve is opened.
Flush those pipes and replace rads.
Flushing:
Assuming you have standard modern rads;
Buy your self an outside tap hose connector i.e. the spout which screws onto the outside tap and takes a push on connector onto the spout. Buy a push on connector that automatically closes when removed from the spout, these usually have a red dot indicator on them.
Screw the tap connector onto the rad valve that is blocked (yes they are the same size and thread) and put your push on connector onto the end of your garden hose. Turn the hose on and push your finger in the end of the connector (opens it) and let the air out of the hose (no point pushing air into your system). Now, with water catcher at the ready, open the blocked valve and stick the connector on the end of your hose onto the tap connector on the valve = lovely mains pressure water forced into the blocked pipe. Probably only need to do this for a few seconds, then pull the connector off (glad you got an automatic closing one at this point) and catch all the black gunge that comes out of your blocked pipe. Once its running clear, close the valve, remove tap connector, replace red, open valves, nice hot rad. Repeat as necessary.
