Sidekick overheating problem

[cbpa40]

I just replaced my 92 Suzuki Sidekick's cylinder head with a rebuilt one. I replaced all the hoses and water pump and flushed the cooling system also. Now it overheats. With the thermostat removed there isn't a constant flow though the top of the radiator while looking with the cap off but flows when reved. Any help would be greatly appreciated.

[Toby W]

have you checked your fan belt?
I've had the same problem with mine slipping and overheating as a result its usually fine at an idle and begins to overheat with acceleration