No pressure in the cooling system. Is that right?

[PABLO]

question: after having a lot of trouble with the cooling system, (too much pressure because the cylinder head was cracked, so all the hoses started leaking) i fixed the head, changed water pump, hoses, thermostat, and now its running ok, temp is always in the middle and a bit less. But the system has noo pressure at all. Is that a bad sign? My car is really running fine, so i guess there is no problem.
What do you think about this?
Thanks

[netmgr]

no pressure when...at start up...running for 20 mins??

[PABLO]

it never gets pressure, not even after driving 30 minutes in highway nor in city

[winfred]

if it's cool outside and the system is in good shape it just may not be building pressure, which is not a bad thing in and of itself, or you could have a bad cap and it's bleeding it out

[632 Regal]

could be the cap on the expansion tank.